Malicious PDF — malware analysis report

Static analysis result for SHA-256 0920f290a0174cfd…

MALICIOUS

PDF

75.0 KB Created: 2021-05-28 08:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f59284639d97494496caee30e4d8c38b SHA-1: 2fcd757e8ab3fa061095b83b50ebc43db95f2c09 SHA-256: 0920f290a0174cfd5009daa5c11b7549493a8a9d261be48a2b0cad74cb667426
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded content, though heavily obfuscated, likely serves to redirect users to these external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/123?utm_term=brothers+songs++2015 PDF link annotation
    • https://ripodomix.weebly.com/uploads/1/3/0/7/130775876/d7e113f71a206.pdfIn PDF document text
    • https://batusapetedovug.weebly.com/uploads/1/3/0/8/130873971/fudajenesozesuloroli.pdfIn PDF document text
    • https://vapatukubarokul.weebly.com/uploads/1/3/0/7/130739856/zixosawamex.pdfIn PDF document text
    • https://venowogofopow.weebly.com/uploads/1/3/4/6/134611371/jenadaburu.pdfIn PDF document text
    • https://zipixaxunisegon.weebly.com/uploads/1/3/4/6/134625234/jelajibifo.pdfIn PDF document text
    • https://fuvexowigirupog.weebly.com/uploads/1/3/4/8/134896800/zaxelote-zikeg-nanizawene-wimanisonek.pdfIn PDF document text
    • https://mizemajawoxulu.weebly.com/uploads/1/3/1/4/131437858/2f8d9673ca2e.pdfIn PDF document text
    • https://famosufed.weebly.com/uploads/1/3/4/9/134900490/9092630.pdfIn PDF document text
    • https://zexorekimapuwip.weebly.com/uploads/1/3/4/7/134702453/jikelamufebew.pdfIn PDF document text
    • https://gatofofuxiwiv.weebly.com/uploads/1/3/4/2/134265530/penelumi.pdfIn PDF document text
    • https://sukewemuzi.weebly.com/uploads/1/3/4/6/134668821/6575379.pdfIn PDF document text
    • https://tajixuxax.weebly.com/uploads/1/3/4/7/134751877/40d5c0eb3401.pdfIn PDF document text
    • https://nenuwuxajifop.weebly.com/uploads/1/3/4/6/134665141/wunebejelikudejetar.pdfIn PDF document text
    • https://gisafumeg.weebly.com/uploads/1/3/6/0/136098567/9850932.pdfIn PDF document text
    • https://rutesusu.weebly.com/uploads/1/3/0/7/130776221/5605455.pdfIn PDF document text
    • https://morinuzarisifuf.weebly.com/uploads/1/3/4/2/134234593/noborosamegakap.pdfIn PDF document text
    • https://zorazuzibenad.weebly.com/uploads/1/3/4/6/134617736/titetubu.pdfIn PDF document text
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/navudodexavejo.pdfIn PDF document text
    • https://safusubugem.weebly.com/uploads/1/3/4/6/134609944/9712921.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f9f8816-4c9d-4770-a1f4-749256a485f2/jidijabipedazesezij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42af4705-406c-4d2d-aa99-2cae63deee00/numodefula.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_off0000e871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE871 5204 bytes
SHA-256: 18155cd50a8bfd01f23a82dc6cb293a0466193dd39f0981fbd51830cfe5e9405
font_01_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 11068 bytes
SHA-256: d4a1eb953b4b9f44de93c5ab1c4526f69ece9785b56dd7807e3de2ece76194f8