Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d688664a2480a7d…

MALICIOUS

PDF

83.8 KB Created: 2021-04-08 03:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d6d01c6c5d6bc27824a2816b0c017e48 SHA-1: 943eb6763dea2cafe9ed363883faf8ae1bed7b39 SHA-256: 6d688664a2480a7d6cd5e006ac607f2aeed3418a8a0d2756eb01f86fe8e0709c
194 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ClamAV and an ML classifier, and it contains a large number of external links, many pointing to disposable hosting. The heuristic 'SE_INVOICE_LURE' suggests a fake invoice or payment lure, which, combined with the link farm, indicates a likely phishing or SEO spam campaign. No scripts were extracted, but the presence of numerous external links suggests the document's primary purpose is to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://nipisod.ru/123?utm_term=manufacturing+business+plan+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485149/normal_60493ec3760bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_60114690d4ff6.pdfIn PDF document text
    • https://sopidafepu.weebly.com/uploads/1/3/4/7/134744384/xefaporirubani.pdfIn PDF document text
    • https://sofusetagiwubok.weebly.com/uploads/1/3/4/3/134320735/zabefefid.pdfIn PDF document text
    • https://zubefexer.weebly.com/uploads/1/3/1/6/131606337/5945740.pdfIn PDF document text
    • https://daniveledize.weebly.com/uploads/1/3/4/9/134900130/55331.pdfIn PDF document text
    • https://lekusilikeveb.weebly.com/uploads/1/3/0/7/130739001/c90a911f1ed8de.pdfIn PDF document text
    • https://tupetipu.weebly.com/uploads/1/3/4/4/134489263/ririzokipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454180/normal_6047db106cfeb.pdfIn PDF document text
    • http://vzroslyh.net/zunodipizijavef3619.pdfIn PDF document text
    • https://zimolitavok.weebly.com/uploads/1/3/1/8/131856331/641b363247f50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501380/normal_6013f4e43726d.pdfIn PDF document text
    • http://nerroba.info/12423140348s7plj.pdfIn PDF document text
    • https://visizejafu.weebly.com/uploads/1/3/6/0/136093068/fisuxulu-mozifusobemudij-pawutali-nusuxe.pdfIn PDF document text
    • http://avit0.cc/98620102210cril7.pdfIn PDF document text
    • https://kobizixudowizeb.weebly.com/uploads/1/3/4/4/134402546/jejamidojunez-ziwugabalu-foxuzixurasad-kufefinofiweke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nalirabagetovop.epizy.com/biologically_important_nucleotides_and_their_functions.pdfIn PDF document text
    • http://bopufadepop.epizy.com/xiroxebejanolazido.pdfIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_1c3d0e121e2943d59bbf2701e6ca91e8.pdf?index=trueIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_a74e3059cdfe452cacf905f57cf80278.pdf?index=trueIn PDF document text
    • http://gegenig.epizy.com/international_journal_of_molecular_sciences_word_template.pdfIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_21dae1ae9d514593b9a0ef6ccb73ccbd.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_off00010931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 5480 bytes
SHA-256: 6ea9f4e161142936fac696873c644c44bca585a2fe6b5321e661121630156ac2
font_01_sfnt_off00011bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD3 10916 bytes
SHA-256: 7b228a7d0d1a9b9a9d5ba6c24d8f90314f56e1f2116f4c9e01c8f0f6d8e02674