Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4aed860836e1bb9…

MALICIOUS

PDF

82.4 KB Created: 2021-01-24 03:21:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7b3a6c5d34e88a03bca77f7d294f1623 SHA-1: ebc573fde41a638b6394650e59a4846f3be83b65 SHA-256: a4aed860836e1bb903cb55cfad467788d1375707a58f85c05596bcc5077fafb6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, many pointing to benign-looking PDFs, suggesting a link farm or SEO spamming operation. The embedded URL `https://trafficel.ru/aws?utm_term=bangla+comedy+movie+hd` appears to be the primary lure, disguised as a search result.

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://trafficel.ru/aws?utm_term=bangla+comedy+movie+hd PDF link annotation
    • https://cdn.sqhk.co/zogobadakedu/f4XzDii/wwe_road_warrior_animal_cause_of_death.pdfIn PDF document text
    • https://xufolonul.weebly.com/uploads/1/3/2/6/132695880/4acf7.pdfIn PDF document text
    • https://cdn.sqhk.co/dugubupa/6Jjejd2/ginuburalidene.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/uCjhgdL/australian_rally_championship_2020.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/janeletaxeti.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/6EhdTP9/smith_s_near_me.pdfIn PDF document text
    • https://jokenobijejadur.weebly.com/uploads/1/3/0/8/130873794/vexagis_wosopukifeduwu.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/kgibDij/stone_bronze_iron_age_timeline.pdfIn PDF document text
    • https://cdn.sqhk.co/lawikuto/jetjgup/jegogo.pdfIn PDF document text
    • https://cdn.sqhk.co/dodazija/qpSMhbv/super_energy_blast_drink.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/6Yt0yT7/silicon_valley_humane_society_spay.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/hba1fye/find_friends_on_facebook_by_email.pdfIn PDF document text
    • https://cdn.sqhk.co/judebivon/FXmLifD/pawemazag.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwebilux/gjaFhiW/74529048881.pdfIn PDF document text
    • https://sakojokotinij.weebly.com/uploads/1/3/1/3/131379540/3304787.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/zuguvoxoki/biblia_catolica_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/62870303107.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/2008_nissan_armada_user_manual.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_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 5288 bytes
SHA-256: f5f1d81785fb6f6c5485aef91ee4e62b61c86621a1aaed8171bbb9b381227389
font_01_sfnt_off0001111e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111E 13648 bytes
SHA-256: b572dd1c9cdb28228b2abcdffa386942267dfd7c98983825d91af6fdcabb2024

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