Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2baeb9ceea94dd…

MALICIOUS

PDF

140.5 KB Created: 2021-04-16 04:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f7c7048756f657003b1bc7856e7aa3c3 SHA-1: f52138889e4760443a9299ace26a42109ad4d7bc SHA-256: cb2baeb9ceea94dd8bfc3e80fbef91a31e9f901a9f1034d902d2e41e2e3a9f68
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=systems+engineering+masters+cornell PDF link annotation
    • http://tinivoze.22web.org/laridapokoz.pdfIn PDF document text
    • http://blue-tick-central.com/free_christmas_invitation_templatesq0or1.pdfIn PDF document text
    • http://eferevole.com/free_online_medical_surgical_nursing_bookuwh3i.pdfIn PDF document text
    • http://carinsusa.com/nudenivobovufilivobukosipon.pdfIn PDF document text
    • http://pekebokunanes.22web.org/holiday_event_ticket_template_free.pdfIn PDF document text
    • http://online-bestshop.xyz/rebalevovumijidifutiwuloz7yp1i.pdfIn 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/af388df2-463e-450b-b830-de6f63eaf0ef/fojidifotojoviwafomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0c33206-7807-4d3d-81d7-3e1448b6b70a/95959052805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d025380-2f54-4fb2-84aa-ff693b261d64/tres_metros_sobre_el_cielo_3_pelicula_completa_espaol_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4140faf8-ddc2-46ee-bc2a-be6909f42f05/75817686195.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e051b77e-f409-4ad0-8286-8437a066fbea/murray_14.5_hp_42_riding_mower_belt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e1a60db-3ad1-4777-8eb5-0b0461c8b391/best_price_stihl_fs_91.pdfIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_611defc3f38549f68c6de730271b0d01.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/13610843101.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/22774477262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2540f99-1f43-4f6a-96c3-9a62bf69d98b/how_to_adjust_volume_on_tv_without_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd6e34d-48a8-45e3-9b91-0faee5445a9e/32458555402.pdfIn PDF document text
    • https://a96990da-dd17-4b11-844c-aba2d588d1b6.filesusr.com/ugd/5e5e7b_b5db28a8fdb749c3868b699540a8ddf5.pdf?index=trueIn PDF document text
    • http://firumod.epizy.com/75361003226.pdfIn PDF document text
    • http://pugunexipidil.rf.gd/40222749905.pdfIn PDF document text
    • http://dinixebun.epizy.com/sivuk.pdfIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_d9c80d7f83664115ae54ef938c8b0e2d.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001eb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB09 5324 bytes
SHA-256: a2d2a05cb662c7600a04b279362406d161373dc0efa0259d06b77ac8ccf24504
font_01_sfnt_off0001fd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD12 11616 bytes
SHA-256: f6d38fb4442eba70e47004e1902517d0241a7baa8d72e37b1d0a5903d5c724d7