Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb50c036efd583c9…

MALICIOUS

PDF

136.8 KB Created: 2021-05-26 19:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 95f87ea0a691e9ab04f5f17674b3db8e SHA-1: c5fcfcf9ce0d43e8c3fd38a34309d316e7847067 SHA-256: cb50c036efd583c9838403e9ca04f163403323a86265374682690b7e02ca5624
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable hosting, and is flagged as a link farm. The primary malicious URL identified is 'https://resalured.ru/strik?utm_term=who+guidelines+for+hepatitis+b+treatment', suggesting a phishing or scam attempt disguised as informational content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/strik?utm_term=who+guidelines+for+hepatitis+b+treatment PDF link annotation
    • https://zidoboxeped.weebly.com/uploads/1/3/5/3/135324118/binesarofadewanowovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424935/normal_6009c141e7e6a.pdfIn PDF document text
    • https://rowagikej.weebly.com/uploads/1/3/4/6/134678960/difajezekowugire.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414868/normal_5fcdc96d9fb67.pdfIn PDF document text
    • https://jovigazever.weebly.com/uploads/1/3/1/6/131637362/3772609.pdfIn PDF document text
    • https://duzejuwilana.weebly.com/uploads/1/3/4/8/134879611/kozatogawifodare.pdfIn PDF document text
    • https://ragojozuzaz.weebly.com/uploads/1/3/4/6/134668900/lujalap_kusolilop_pabowafikud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450519/normal_5fc71b7b6db3e.pdfIn PDF document text
    • https://wubobuxidozexe.weebly.com/uploads/1/3/4/3/134322977/9703445.pdfIn PDF document text
    • https://pudajokorafub.weebly.com/uploads/1/3/7/5/137516447/5619021.pdfIn PDF document text
    • https://vebafuxitupum.weebly.com/uploads/1/3/4/8/134890404/1694934.pdfIn PDF document text
    • https://misirukizos.weebly.com/uploads/1/3/4/0/134017349/f3184db7250.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447252/normal_5ff8101acaf42.pdfIn PDF document text
    • https://penukigoguni.weebly.com/uploads/1/3/1/6/131606127/a3464adde38269.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8ecdef9-8063-419c-9592-182edfab2651/321463361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4358aab6-572e-4a95-b91a-ceeb2c63efac/trane_xl_80_high_efficiency_gas_furnace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a8f6836-eb0b-49b3-808b-92dc388b1e01/penama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91f116f9-1e9b-40c0-91f1-aa2c52559e9e/69917219795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/160c010e-d536-4e3c-b83a-4441df4778ae/how_do_you_put_pictures_on_an_aluratek_digital_frame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4635f2f-42a8-43af-9f07-3ba4652aa28d/ropikanelexon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/235c62b9-64e5-40cb-99c8-279bd01e1f6e/que_es_una_bisutera_artesanal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fecb22cb-2d53-409f-9aee-8b296989fbbc/how_many_rivers_does_new_mexico_have.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7154fc2-885c-44a6-951a-e56245b87231/one_flew_over_the_cuckoos_nest_summary_part_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ca29efc-5ed8-4666-a9e7-9f176ed857b2/present_simple_and_present_continuous_exercises_a1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0f5aa59-423c-4756-9bd8-a68acb976cbd/vewidibapat.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000199ff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x199FF 56036 bytes
SHA-256: d9ebc759b064ee003a31d00061ebf868c56a054906c0dbd0e1fe5fc63ffc8dc6
font_00_sfnt_off000171f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171F2 5608 bytes
SHA-256: ab84ab41121261c5a5d01e8e292b88c8daec7b6c512efaa2845baf7313256aac
font_01_sfnt_off000184ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184EA 2140 bytes
SHA-256: fd0baac36cf8fc893687cbe6b3b8165417b6c4fca046c9a5e64821bfdf5295b8
font_02_sfnt_off00018e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E5A 3772 bytes
SHA-256: 0a4742a7d30518e93b516112d6a49ac15dea1c2fdd3760b08880524b17fca9ea
font_04_sfnt_off0001ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF56 11108 bytes
SHA-256: 4e8a0576f7cd5de50619be21f186a6adcde776afa56e6abd7428eab778fce51d

Open this report in the interactive analyzer, or submit your own file for analysis.