Malicious PDF — malware analysis report

Static analysis result for SHA-256 923528d74dda1df5…

MALICIOUS

PDF

76.6 KB Created: 2021-02-26 08:47:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5adae68932a53c1344fe1f802d0af2e5 SHA-1: de358d4a459f1c2c350bcb6a594e0db4d1816a16 SHA-256: 923528d74dda1df54ce842bb68e8bfd65c669879f23ca3f835f48041cdb9ad1a
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-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.
  • 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://druttle.ru/strik?utm_term=john+deere+x300+spare+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389085/normal_60308ac4656a3.pdfIn PDF document text
    • https://cdn.sqhk.co/difanemifal/jhehjij/wowiluzopa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425910/normal_5ff5a5944d453.pdfIn PDF document text
    • http://bigno.space/dukunojijutodadap8mui.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/cighggj/centrist_party_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528260/normal_6029a8a63f259.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450250/normal_6015f22d1d92c.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/HhfjjW2/siren_head_survival_horror_game_apk.pdfIn PDF document text
    • http://fringigejy.site/81234653409j2s.pdfIn PDF document text
    • https://cdn.sqhk.co/votawusebak/JSWihaW/kuxukabukebegi.pdfIn PDF document text
    • https://zawobulogu.weebly.com/uploads/1/3/1/0/131070044/zuluzewoka_lisopejiwib.pdfIn PDF document text
    • http://sparzha.club/86741413434ygmgj.pdfIn PDF document text
    • https://cdn.sqhk.co/pomiziluda/iqQ3NAP/pibarajukejufikoz.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/iJAHxhj/tank._io_online_spielen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464878/normal_5fc6dad76b7b2.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_off0000ed44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 5376 bytes
SHA-256: d24c8dddec58459544cadeece040dbee210e8868bdec76fa3daad7eea8300f30
font_01_sfnt_off0000ff83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 11132 bytes
SHA-256: e4eac2ecdfd3fd2aec35fa4a25cfa19c3acbe5fd7982869831088d649414ca99

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