Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8854e5e5095ecb8…

MALICIOUS

PDF

78.1 KB Created: 2021-02-24 19:45:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d69e1aae5533a63f68ecea895dbf639 SHA-1: 7896101f702903893a3c3ba596b46c94e6975eb5 SHA-256: e8854e5e5095ecb8777bfce2aaa2b19f08b3a94bb61b90679831e2aee101f6af
126 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 are indicative of a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

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/award?keyword=world+map+with+oceans+and+continents+labeled
    • http://kenugizi.getenjoyment.net/why_is_my_dishwasher_not_fully_draining.pdf
    • http://gosoxegekiri.mywebcommunity.org/phone_claim_affidavit_verizon.pdf
    • http://bibuzikufaje.mygamesonline.org/tactics_by_gregory_koukl_free_download.pdf
    • http://xafevak.iblogger.org/.pdf
    • https://static.s123-cdn-static.com/uploads/4425237/normal_5fe2a0a379081.pdf
    • https://cdn.sqhk.co/zefafulolit/fZhVZVT/wimib.pdf
    • http://rimka.xyz/29321163895ef24f.pdf
    • https://static.s123-cdn-static.com/uploads/4448346/normal_5fffb7d01d328.pdf
    • https://cdn-cms.f-static.net/uploads/4455194/normal_601314e6d874b.pdf
    • http://ronifibofizet.medianewsonline.com/tapanixinesigipirarizag.pdf
    • http://kutatit.getenjoyment.net/37862128307.pdf
    • https://cdn-cms.f-static.net/uploads/4425005/normal_6020899e2d58d.pdf
    • http://sugameloxufe.mywebcommunity.org/57826248856.pdf
    • https://static.s123-cdn-static.com/uploads/4501804/normal_5fe29cc7e7dd0.pdf
    • http://gojavodevagajuw.mygamesonline.org/what_does_a_large_sweet_potato_look_like.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://buvodadixasiz.epizy.com/86297785459.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef42.bin
8bc96930224a6d1d1bd973a7ebad4eab586b6cf5c6260b170e6a577e70fd0d1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 5556 bytes
font_01_sfnt_off00010204.bin
c7479d3c0be18b8a20138a6ac6ab433c3b8390e95b5b3a476c82a01ea45e0406		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10204 12032 bytes

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