Malicious PDF — malware analysis report

Static analysis result for SHA-256 886640640b73bf02…

MALICIOUS

PDF

78.6 KB Created: 2021-05-31 05:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 112577443de190627e8f078de28c2f6f SHA-1: ad269dce3f5cd3654524dfa0a056c279a66f8d5b SHA-256: 886640640b73bf026dfbf91554c8e42496fd93ece57048cf7e8fb6d462303117
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/123?utm_term=german+learning+pdf+file PDF link annotation
    • https://jotogenawe.weebly.com/uploads/1/3/1/4/131406354/280340ec0d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407304/normal_5ffc9ca4968da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496001/normal_602c037a24ba2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408865/normal_601bfabae40af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496616/normal_5ff556da996de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_6041b922283b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501962/normal_602d6948df6a7.pdfIn PDF document text
    • https://tikefukexizuse.weebly.com/uploads/1/3/4/8/134879623/ba8f5ee1fa.pdfIn PDF document text
    • https://vaxulisexo.weebly.com/uploads/1/3/4/6/134600260/kibojurixejasivogo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444370/normal_5fffd9587d363.pdfIn PDF document text
    • https://dapasubasawesol.weebly.com/uploads/1/3/4/3/134383907/kidaxixolezowo_dejedijuvolufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443823/normal_6016006838f36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387235/normal_5fc9f9d8644c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387232/normal_604af4fb26cb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463277/normal_603137e3e00b5.pdfIn PDF document text
    • https://lewaxirilukuxod.weebly.com/uploads/1/3/0/8/130813115/3d2391b8.pdfIn PDF document text
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/nugobeniwubavezuliru.pdfIn PDF document text
    • https://vinenuji.weebly.com/uploads/1/3/1/4/131453259/lexavubuwiw_webitopatabiro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484097/normal_6055156884ff0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418199/normal_604052eebfd12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470543/normal_606568a78c877.pdfIn PDF document text
    • https://kukuwusak.weebly.com/uploads/1/3/1/3/131379738/gutol_xademivenu.pdfIn PDF document text
    • https://fokatofevi.weebly.com/uploads/1/3/2/7/132712268/6105289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382960/normal_60691f23abe27.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4454562/normal_60affd7e29ee2.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
    • 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_off0000e8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BA 4812 bytes
SHA-256: 0373414fedd11410877ec32e971a382519c9cc4102e0266dab8aec37a676d5cf
font_01_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 11156 bytes
SHA-256: d1429fbf2ded415be00eaef2cb4e5205bb784a538e382993f3c9f80e93f1222a
font_02_sfnt_off00011ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3