Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51bcef8640a6a26…

MALICIOUS

PDF

84.8 KB Created: 2021-02-09 20:16:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9b4b8d6cd4e56c8f785bf291b64c41ff SHA-1: c03bdbf8791f97fb2aae45bcffe83b321a708b54 SHA-256: d51bcef8640a6a265da9215abd18ebf6a9828cd98e1f3f39d543d7adb99ca9d0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and employing UTM parameters, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are consistent with a phishing lure or a downloader for a second-stage payload.

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://jacksth.ru/123?utm_term=disrupted+dan+lyons+pdf PDF link annotation
    • http://iqecoportal.ru/renurovelusixexedamklj1z.pdfIn PDF document text
    • http://govnososal.xyz/57618765708a6snk.pdfIn PDF document text
    • http://brumbum6.xyz/basic_engineering_circuit_analysis_190hld.pdfIn PDF document text
    • http://dkblogin-de.best/godiwasukujudevilibiwod6d8r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382948/normal_6013396f2c0a9.pdfIn PDF document text
    • http://differencecheats.net/shopdisney_uk_baby_yodapx214.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452599/normal_5ff1b4473c78a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_5fea03ccbf264.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451231/normal_5fc6a22c00cdf.pdfIn PDF document text
    • http://austritkfa.com/stadia_free_vs_prokvu4d.pdfIn PDF document text
    • http://outputqwvk.space/kitudot8nyb9.pdfIn PDF document text
    • http://begdas.fun/faramazixepazubgan.pdfIn PDF document text
    • http://govnososal.xyz/samsung_notes_not_working_after_update_2020i8m87.pdfIn PDF document text
    • http://bitsracing.net/50303665408ai2s.pdfIn PDF document text
    • http://afracheat2.xyz/58396079379nt40a.pdfIn PDF document text
    • http://servisvds.ru/world_war_2_heroes_ww2_fps_mod_apkari9s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nenunosulijud.rf.gd/35919272163.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_off00010e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E49 5136 bytes
SHA-256: c1ea0392bb64ff03a423471f58a57163a507bffbe8845c198c06e4805e699cdb
font_01_sfnt_off00011fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE1 11448 bytes
SHA-256: 9d8c3ca9237eb75a357f8aeba98a39b1e5fd7cd67a4e4b32b2b3a5982cf03ec5

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