Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a579d7abef8afe…

MALICIOUS

PDF

76.4 KB Created: 2021-04-07 18:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b5ed457557b19205e5c4b4722ad130d6 SHA-1: cf71fd3a7a28ab0650552b6e90da3f7db990d2c9 SHA-256: e2a579d7abef8afe68f9f23278e3488f7218a71283acea349cd3fb2ae4266a9a
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://vilenefex.ru/strik?utm_term=bsa+sweet+22+6-18x40+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413117/normal_60466cf235e9a.pdfIn PDF document text
    • https://bowukobi.weebly.com/uploads/1/3/4/7/134706413/xusiwofod.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/versace_chain_reaction_red_watchponlq.pdfIn PDF document text
    • http://wow50.pro/air_conditioner_repair_book_in_hindijr82k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422390/normal_6032bb3e4aa2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456399/normal_601fe1a51e233.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389794/normal_5fdfd9cdc8293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375199/normal_60241bf2c547c.pdfIn PDF document text
    • http://madamzero.com/penevebixadodadokok4hycd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420608/normal_5fd7894792c33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481271/normal_601095e2cf5ff.pdfIn PDF document text
    • https://videxopefofima.weebly.com/uploads/1/3/4/1/134131768/wolapivu_detaguja_walewewukulig.pdfIn PDF document text
    • https://jaxikagiwuzeno.weebly.com/uploads/1/3/4/6/134698588/6033039.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/454da189-5ffa-41e8-863e-15550e3b0861/51538959108.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/printable_fruit_of_the_spirit_coloring_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/diterezimoluwijazug.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/nelazeweweninuvawobeki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/481ae5ec-d457-485b-81bc-c0978ac141b8/lapugarixaxefemulixobefox.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_off0000e6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E5 5764 bytes
SHA-256: 967300d787b358d58f3115becc86ec3ac04083e2084152b691794a5e0f440790
font_01_sfnt_off0000fabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABF 11784 bytes
SHA-256: 0e90621d9f358e6162b8db6cd5353a033d9f6019638e87d227279672d93eb800

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