Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb89e7155b659fba…

MALICIOUS

PDF

85.5 KB Created: 2021-05-01 20:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 74039bf7aebb26d4e841cc96440228d7 SHA-1: 201d8be965d1374b5580c4972c84b0ed04db0ddc SHA-256: fb89e7155b659fba746889feaabd7ac0019caa14249772ed86635f9a04a3219f
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 hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/strik?utm_term=canon+eos+rebel+t5i+dslr+camera+with+18-135mm+lens PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393028/normal_60165fd8b4081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409826/normal_6026f74c3255c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418166/normal_603f7ed3bce2e.pdfIn PDF document text
    • https://bazafegaxu.weebly.com/uploads/1/3/1/3/131383427/18755d9c266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454046/normal_603329c53890a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370768/normal_6028a6e375de0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465949/normal_5ff5e2d772ae3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452206/normal_5ff161bdbda52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456387/normal_5fccfa51ea667.pdfIn PDF document text
    • https://kibodoru.weebly.com/uploads/1/3/2/6/132695707/debevit_xevez_jivaridokak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469630/normal_6035ff1f248c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488556/normal_601ae7e3f1bf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496146/normal_605f574f4180f.pdfIn PDF document text
    • https://dewuvibemezifo.weebly.com/uploads/1/3/4/7/134763410/kejiwifuserokogaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390057/normal_5fda8fdf63a3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499299/normal_603fbcd8564ef.pdfIn PDF document text
    • https://kagilomit.weebly.com/uploads/1/3/4/6/134669997/296bd3e72a9f7.pdfIn PDF document text
    • https://buzixigadojaw.weebly.com/uploads/1/3/5/3/135316262/af8eb9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vapojolojumow.rf.gd/kenagowuro.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/wind_in_the_willows_play_script.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/8703989738.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/diet_reset_book.pdfIn PDF document text
    • http://wisotoginiso.rf.gd/como_aprender_ingles_livro.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/2666778116.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_off00010ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC0 5884 bytes
SHA-256: 32062e4aca4331722f0d7019657b951523183611320dcacb9ae7f1db5ea99c9a
font_01_sfnt_off000122b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B4 10968 bytes
SHA-256: 5f46a6a97a8eedc94dfdb673d6865e92549246805040b4dc9f1575daaa85c19f