Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7510fe1348e799…

MALICIOUS

PDF

71.5 KB Created: 2021-06-05 10:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6a033533ed0a23c99aee6a6d91d6fcd1 SHA-1: 20a9e5e934ce961fbf8972630050b5b0bba04c0c SHA-256: aa7510fe1348e79952779af8f895bdaf58851d3b3ff1a0be0ca0ba7ef5292253
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/pbw?utm_term=fill+in+the+missing+number+worksheet+1-20 PDF link annotation
    • https://rusokupos.weebly.com/uploads/1/3/4/4/134468665/d598e215.pdfIn PDF document text
    • https://vozidetuvotivex.weebly.com/uploads/1/3/6/0/136094215/a84ef28ab.pdfIn PDF document text
    • https://sajefabavasa.weebly.com/uploads/1/3/2/7/132710755/caa04e340.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_605413eced965.pdfIn PDF document text
    • https://zejifibesus.weebly.com/uploads/1/3/4/5/134586543/cff7232b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383334/normal_6056efe87709b.pdfIn PDF document text
    • https://rixafewokeget.weebly.com/uploads/1/3/0/7/130739987/mopago-zutawulupupo-gexixigoligipar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501208/normal_5fcf8ced54752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401714/normal_60299b980e453.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pewudomame.pbworks.com/w/file/fetch/144616716/why_my_lg_fridge_is_not_cooling.pdfIn PDF document text
    • http://pulixojesu.pbworks.com/w/file/fetch/144512031/82334610682.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/lafavebapomawuvevakatepo.pdfIn PDF document text
    • http://palejemevat.pbworks.com/w/file/fetch/144586878/nintendont_latest_version_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f8bebce-7aea-4004-abeb-c66919f488a3/piditasume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97dd46c4-6c07-449d-9892-3416d764ac63/define_motivation_in_sports_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e9cb99-74f8-4630-820c-2944bdf8f0bf/hp_laserjet_m1212nf_mfp_scanner_not_working.pdfIn PDF document text
    • http://barumena.pbworks.com/f/50801922713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65e02c82-be47-41e1-aa55-3f5917f255be/molde_para_hacer_un_prisma_pentagonal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7208c2fe-8858-44af-bbf1-3e22ef6638b8/rezifonulerab.pdfIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144418596/2020_shortwave_frequency_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62322eac-f5d9-4e6b-be26-e6f59145f8bb/how_long_does_it_take_to_charge_the_mophie_powerstation_xxl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcdb070f-874a-4fac-ac1f-821387fce11a/jobonugifegikawugelolavuk.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/w/file/fetch/144423051/how_to_wash_my_milwaukee_heated_hoodie.pdfIn PDF document text
    • http://zedilowozare.pbworks.com/w/file/fetch/144589809/oxford_dictionary_new_edition.pdfIn PDF document text
    • http://giribuv.pbworks.com/w/file/fetch/144542859/81369421825.pdfIn PDF document text
    • http://felefejimax.pbworks.com/w/file/fetch/144582897/82246316999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cb5f268-838d-4d60-ae90-f1fcdcdcdc39/what_are_the_five_elements_of_the_hierarchy_of_process_design.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E8 5496 bytes
SHA-256: 4ec6110b593758efbc04e579de85b53e7c71e1878eb66f7874e6ae8296251714
font_01_sfnt_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 10508 bytes
SHA-256: 78f1451be6cec78306a8f31f19e88a13607030a6421007e45bff500c931569d0