Malicious PDF — malware analysis report

Static analysis result for SHA-256 4216178494d3a334…

MALICIOUS

PDF

73.5 KB Created: 2020-12-27 20:48:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0aa28e697fab5cc9b0a8117a3b78add7 SHA-1: cb872f71950866b8a60ccbed96a77a352a51779a SHA-256: 4216178494d3a3346d735e1a30bd58f7bf14bf619796deaade28053443ff3ed3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://trafffi.ru/strik?utm_term=by+the+seat+of+my+pants+idiom+sentence PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376087/normal_5fda1d455bd54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404112/normal_5f9be13d32998.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484618/normal_5fcc0e4d42f03.pdfIn PDF document text
    • https://vefarekosisag.weebly.com/uploads/1/3/4/7/134722728/sanawedunerez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487906/normal_5fba28844fd17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460255/normal_5fb3f5b2a219b.pdfIn PDF document text
    • https://nitaluba.weebly.com/uploads/1/3/4/3/134348735/3745350.pdfIn PDF document text
    • https://bujasosepamus.weebly.com/uploads/1/3/4/6/134626994/laligez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387715/normal_5fc6ad313a6ce.pdfIn PDF document text
    • https://mudagetani.weebly.com/uploads/1/3/4/3/134381332/2d4cfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426972/normal_5f98021971e88.pdfIn PDF document text
    • https://tijisuxijofijo.weebly.com/uploads/1/3/4/3/134374136/vebuzit-wijukamaguzego-lisexaretofo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402481/normal_5fd039393aabd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tevigotu/16528110684.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/berzerk_ball_hacked_unblocked.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_off0000ddc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC7 5416 bytes
SHA-256: 9732e52c9d7d08844f0c6171cb6784d74e026d7c2968f127785a3cc47989b20d
font_01_sfnt_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 11568 bytes
SHA-256: e736fe979756b4d90e5a6477a5330c9b19b0ebc1a03961bd38abc20becaaf00e