Malicious PDF — malware analysis report

Static analysis result for SHA-256 854b0242ed426922…

MALICIOUS

PDF

82.7 KB Created: 2021-05-17 21:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 09fb5e31fbb5684457cf35606a5dc4c6 SHA-1: 4823528c1eacf2de8dc7e938b2e7ac46c91cd5b1 SHA-256: 854b0242ed426922a079bf91f80b0b2efbe9ea5fe6eca63c737ce15f54b12dda
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://baarspo.ru/strik?utm_term=sports+marketing+4th+edition+year PDF link annotation
    • https://vuzufakafedovi.weebly.com/uploads/1/3/5/3/135347170/752191e2be9.pdfIn PDF document text
    • https://vakonawokedoze.weebly.com/uploads/1/3/4/5/134522954/sejexatexilape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417032/normal_6041cda5821c6.pdfIn PDF document text
    • https://zuwexonoporij.weebly.com/uploads/1/3/5/3/135317719/7631210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_60531b3b5f4a0.pdfIn PDF document text
    • https://fuvipizewovotat.weebly.com/uploads/1/3/1/0/131069886/97968e4417.pdfIn PDF document text
    • https://fexiragija.weebly.com/uploads/1/3/1/4/131409693/tonuwerazi-bimuvatusatu-zarorogon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401716/normal_6018ea64bed10.pdfIn PDF document text
    • https://sinekagu.weebly.com/uploads/1/3/4/8/134855021/duvedolalusiz.pdfIn PDF document text
    • https://kotuvowomikek.weebly.com/uploads/1/3/4/3/134370123/melizejebad_wolamulem.pdfIn PDF document text
    • https://lutovadefok.weebly.com/uploads/1/3/3/9/133997447/e6f3abc82863a.pdfIn PDF document text
    • https://galekogikelubem.weebly.com/uploads/1/3/1/4/131438025/ruworit_sogozilumixon_lokefusizo_tewusilorigez.pdfIn PDF document text
    • https://loxojewumiv.weebly.com/uploads/1/3/4/6/134651611/kebedivusisiva.pdfIn PDF document text
    • https://gimoxawoja.weebly.com/uploads/1/3/1/3/131380550/f79b3ed05e00d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454430/normal_5fefd9abdc7c3.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/1ae4793c-76c8-41b6-8b16-5bb2bd1dc66b/94484972707.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/dmax_spanish_tv_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5623480-401d-43c1-9ecb-f029325da754/xuvonabezogijiziwafid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74256e54-93a0-4f37-8f30-3a1798bb3a5f/zixuvewemosumiten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b6ec46-6a5d-496a-865b-6f0f8662e1fc/45078952786.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/kenemuwunelened.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/48316141943.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/5082435327.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_off0000f778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 5484 bytes
SHA-256: 2da31d4261b6b3d10dff28cb38804070279137d6487fe9338b5b37e383b3835a
font_01_sfnt_off000109f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 10996 bytes
SHA-256: a0ec6e14d79f3da9f539d519eb0bfcbb06a405944a5fe6f00a44e34759ee61ea
font_02_sfnt_off00012eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB7 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361