Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf95ae0cf964292…

MALICIOUS

PDF

101.0 KB Created: 2021-06-08 18:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c467e3d523c6160b88692a7f1ddbe1c8 SHA-1: e36727f731cb7346541f5a7dac8965dba5409958 SHA-256: 7bf95ae0cf96429213fc1750c5102526ffb3e34960be6e387850e0cdedcd04b5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=dj+dance+tracks PDF link annotation
    • https://vozexipazaxa.weebly.com/uploads/1/3/4/4/134444785/9773203.pdfIn PDF document text
    • https://wupizesave.weebly.com/uploads/1/3/4/5/134581048/sigodejinimirixu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486367/normal_5fc7f3309c6c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423752/normal_6057c389dffcd.pdfIn PDF document text
    • https://wepebajaka.weebly.com/uploads/1/3/4/5/134588919/zedetamule-mukedejik-mepani.pdfIn PDF document text
    • https://kuwisuzom.weebly.com/uploads/1/3/4/0/134017610/a369a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446283/normal_5fd72e41d5d27.pdfIn PDF document text
    • https://tapajiwegunet.weebly.com/uploads/1/3/1/3/131380495/fejalivumutagazi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392864/normal_603b0662cf01f.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/b3e8634eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410975/normal_60251b122e63b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/cc89a050-a059-4568-bc90-92429033f0bd/shark_euro_pro_x_sewing_machine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86a28b56-9aa7-46bb-b4fb-be790c0a2b96/vepipexiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec7eb37f-6a61-4a7b-9f1f-251334b3fa3d/velagamobovesozowowip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb5cf8e-dd85-4dd9-8bb9-44dd6794ef27/55497410066.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfc0ef22-9ef1-4d8e-8b0a-c20bac2dc124/its_kind_of_a_funny_story_movie_watch_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15ae0702-3a58-4fa6-8b52-9d832fa8745c/12687230237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4454b18-3ae5-4ed7-b193-07868d364a35/nemisopuworosemovavaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ee7816-a586-4606-a776-250c4964b535/petirafiseru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99af966c-88a1-4be0-a981-c63b54cdb2c8/2018_subaru_forester_manual_transmission_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f90ce0e-61c4-41b6-a309-71f12c1b6855/58693059868.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCD 4668 bytes
SHA-256: 7b2505103d4e6fd32c0702c1d87b22a7a515895bb0c315938dd1a1018f723627
font_01_sfnt_off00014fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB9 11628 bytes
SHA-256: 4316555e673735f58bfd5501e2d460afc1a66e86bad8b70f98e2289e5d2ad234
font_02_sfnt_off0001776a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1776A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378