Malicious PDF — malware analysis report

Static analysis result for SHA-256 815604042b7c1220…

MALICIOUS

PDF

78.5 KB Created: 2021-02-28 22:26:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e939c878a716da1ebdbe2724c6ba8d9b SHA-1: b1574c774d203b0177187e68550d52b756882d5e SHA-256: 815604042b7c12206bffe35a52ecdee15c519d56a8007d4f7a38f56b02fea40b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=molduras+para+puertas+de+carros PDF link annotation
    • https://cdn.sqhk.co/fupokonabat/37jgTgf/23306141393.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484812/normal_5ffc87de1c27f.pdfIn PDF document text
    • https://lufegema.weebly.com/uploads/1/3/4/1/134132410/3910997.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416493/normal_602bda46e259f.pdfIn PDF document text
    • http://itchia.space/morning_shiv_bhajan_mp3_free_download1805f.pdfIn PDF document text
    • https://dimutaribosisup.weebly.com/uploads/1/3/4/4/134444719/vatalewos.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/gu2zoT9/10105594211.pdfIn PDF document text
    • https://wewofubajibopa.weebly.com/uploads/1/3/1/3/131381003/6060883.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403824/normal_5fee501abf05d.pdfIn PDF document text
    • http://gelchlen.fun/tusevaroleromepemoraam4v1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469852/normal_6030516e6ce2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414174/normal_5ff6a8ff24990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417040/normal_60325a506c90c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 5072 bytes
SHA-256: 5d8c9bff3e9efc91f91a6bf872b1274d55698dc4cfac156264409f0a5ce6b35f
font_01_sfnt_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 12456 bytes
SHA-256: 91cef2f1f208a0645620caed2cdcf39500955e7d98add0a58d506e2dcc0f2c17

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