Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f2094508d71fb1…

MALICIOUS

PDF

75.7 KB Created: 2021-02-13 04:10:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9a71de5384ee08ef6f7c1317562d52fd SHA-1: 5f62d1b2afeb67cad13ef3e55fbda43bce9d128b SHA-256: 85f2094508d71fb1aae80c9250cbd7480561a2953345b3b990319e1c47cbb068
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/wix?keyword=rf+engineer+salary PDF link annotation
    • https://xajobukemuxup.weebly.com/uploads/1/3/5/3/135398270/628343.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451955/normal_5febdd478a8a0.pdfIn PDF document text
    • http://cleanup-sale.site/lufopefazmw4uc.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/iaJijKL/appradio_mode_compatible_apps.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebililofo/aicibhe/750014231.pdfIn PDF document text
    • http://vsedlyatebya.xyz/sumerian_cuneiform_alphabetxe8yj.pdfIn PDF document text
    • https://nenejiremox.weebly.com/uploads/1/3/0/9/130969141/vitavapul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483097/normal_5feb34a35422b.pdfIn PDF document text
    • http://skidki-day.store/demons_of_the_fleshe4vx0.pdfIn PDF document text
    • http://prizinsta.site/7927546270cosgx.pdfIn PDF document text
    • http://clebohets.xyz/65903022984nlihg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_5fd62c2420604.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454811/normal_5fe1ed78b3dce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446017/normal_5fd92de6905c3.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/wipotegadodorek/apple_carplay_software_toyota.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_off0000e001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE001 5044 bytes
SHA-256: d284b4bc5cfc1f65a5c128f60b3296657469c5561047b43cfb381951bf54e1dd
font_01_sfnt_off0000f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 15284 bytes
SHA-256: ad42f943f1632a8ed28f8b5705276f8c88068c4305fd4682687f631862d05a81

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