Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e0959bfcd0006f…

MALICIOUS

PDF

72.0 KB Created: 2021-02-24 09:45:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 533a9507e495a30054976ec8a31cc72b SHA-1: d6152d0b5c96b461c6b178a169494006ec01a71e SHA-256: 91e0959bfcd0006fe7a09eb2f13c238b9c289b85c3ee6d5acd708ab009213e4f
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 URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://bologen.ru/aws?utm_term=how+to+change+oil+on+yardman+snowblower PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4461485/normal_5fca7fc2d8097.pdfIn PDF document text
    • http://present-mag.ru/vebubifepixikujevmyd43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_6013866fba8d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462976/normal_60292bf2c854b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446016/normal_5fe1c0530bc69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_600fad2542174.pdfIn PDF document text
    • http://sport-stavki.fun/67712444587cdg31.pdfIn PDF document text
    • http://crawlmqyu.space/stickers_memes_whatsapp_apkhpq9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415334/normal_60335341490c9.pdfIn PDF document text
    • http://smartbright.club/980987293168s9bo.pdfIn PDF document text
    • http://clientbluebadge.com/dikusamagabasabur4efkg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mojelol.epizy.com/dilbar_dilbar_dj_song.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/savulugijonenepodagob.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/laziduzixomujakes.pdfIn PDF document text
    • http://vumavoralamo.rf.gd/tajuwesidewujinonelumura.pdfIn PDF document text
    • http://pofedeguw.rf.gd/ovid_metamorphoses_latin_and_english_side_by_side.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_off0000dc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 5648 bytes
SHA-256: 344767c3ca68d48d041e14688c52ca166c65c16695749bf46e38a3e971af84d4
font_01_sfnt_off0000ef51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF51 10412 bytes
SHA-256: 1e16f6f2567aefa0e681543617ddd5dd500d0b5446607d3dc78db59f9efa9307

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