Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d15a12ea7d14c3d…

MALICIOUS

PDF

78.7 KB Created: 2021-03-17 11:29:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 47c21acd20d14e2f231076c24d47cf80 SHA-1: 21e3493c556f40119b3e8e931b42bf025a6efe5a SHA-256: 4d15a12ea7d14c3df07fc1783d24fd54e8725afff0a0e0ea7552194e32748f74
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 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.
  • 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=excipients+used+in+tablets+pdf PDF link annotation
    • https://cdn.sqhk.co/ronuwimo/gEjciib/62596501259.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/didghjf/christmas_clogging_cue_sheets.pdfIn PDF document text
    • http://xupoluwifokolo.22web.org/kijorogumakonafoxu.pdfIn PDF document text
    • https://xasejudezorakoz.weebly.com/uploads/1/3/0/8/130813307/jisowafibazabeba.pdfIn PDF document text
    • https://cdn.sqhk.co/gevanadu/Wgeggc8/35703257520.pdfIn PDF document text
    • https://zefugomifavo.weebly.com/uploads/1/3/6/0/136087281/rotutetipejitoj.pdfIn PDF document text
    • https://cdn.sqhk.co/sowojusawepu/ohe68ct/xanugiwodijisugoru.pdfIn PDF document text
    • https://lexolegav.weebly.com/uploads/1/3/5/3/135350326/dd9dc2fcfb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/litunux/capitalized_balance_sheet_definition.pdfIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_38a61cd303b9486fa72cd5ed838f5afe.pdf?index=trueIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_c8a961c1d0a04bafb200c6676fa1c395.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/cambridge_young_learners_english_starters_free.pdfIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_3e0c99c6971c4c4299fb071167ab96f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/046f2e4a-48f0-4e7b-a856-8252bc5ba237/69220323628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e043597-2b07-420c-994e-20e847625e22/diana_palmer_book_list_with_summary.pdfIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_60c3e62cb92d47b38fc525aef12b167e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/58fca758-fcd7-44fb-9d1f-b676a0fc5693/conair_garment_steamer_troubleshooting.pdfIn PDF document text
    • http://jaxilikujo.rf.gd/zekakaju.pdfIn PDF document text
    • http://selaxarizipa.rf.gd/fifedo.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/20740117950.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_off0000f6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E1 5216 bytes
SHA-256: 906d5a8e0c252f6dc1b656228cb714a509d04b665981cdbff556c46605353de2
font_01_sfnt_off000108b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B7 10748 bytes
SHA-256: 4917808911d64da1b70813c706dc42ad06eb1cf4f0f695f7f782271040e13854

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