Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0fd5f19a414c634…

MALICIOUS

PDF

64.1 KB Created: 2021-02-15 11:55:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5de2d788105ae7eba7f2ab775b3f7756 SHA-1: 160d6c8b8c95daafc51b8c1a470a374f9085c70d SHA-256: e0fd5f19a414c6347eefc6237c2fbf1b42fcfe88df11dec60928e44ab00d8838
156 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 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 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.
  • 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/wix?keyword=pictures+of+poinsettias+to+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450039/normal_601badc7f20e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390056/normal_60046b27de22b.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/Shjx8u4/ant_colony_optimization_algorithm_matlab_code.pdfIn PDF document text
    • https://gopebuxagofu.weebly.com/uploads/1/3/2/6/132681698/xomovuvivejewiwek.pdfIn PDF document text
    • https://rezodipegizosif.weebly.com/uploads/1/3/1/6/131606434/pugafidejan-keguril.pdfIn PDF document text
    • https://zizonilorixu.weebly.com/uploads/1/3/4/7/134772478/536d98fe7c7c6b3.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/96HlYhh/wasapodadi.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/ghaxgib/29002124520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483586/normal_6025c12d511a9.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/bYjhjac/dictatorship_forms_of_government_definition.pdfIn PDF document text
    • http://halfraire.xyz/8370710151bxka6.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/kotodur/jatudezuvizoruligore.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/tifididutoremojagaji.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/verbal_reasoning-_practice_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/bossmobi_ringtone_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/84122036458.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_off0000c0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C7 5240 bytes
SHA-256: cc858a6697aba7f77d93aa8830dbcc82bdc6486e198c944d4e5ef9607c4200ca
font_01_sfnt_off0000d2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BB 9604 bytes
SHA-256: 638b24aee4064fdbf069eb41d49595d5ac442fbfecd780fc2744298389d48945

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