Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cea7b88b2f9f7b…

MALICIOUS

PDF

72.9 KB Created: 2021-01-26 18:51:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7c7192d51c3aa465b940ef17b1c88b21 SHA-1: 29b4bf6707165acf15a5bdaab42193528b2fa1d6 SHA-256: 51cea7b88b2f9f7b4b030c79eb8fd4536255ff6eefa06b14a2b4b6f735a38fde
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malicious content delivery mechanism. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of external links and the 'Pdf.Phishing.Trojan' detection indicate a likely attempt to redirect users to malicious sites or download further payloads.

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 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://seumenha.ru/aws?utm_term=mma+weight+training+program+pdf PDF link annotation
    • https://cdn.sqhk.co/putizimetiwe/cvwhdo0/fresh_fruit_birthday_cake_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/gjihehj/text_twist_2_free_online_shockwave.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/CSVjiji/56659753329.pdfIn PDF document text
    • https://cdn.sqhk.co/dezosanag/40hejdL/disneyland_paris_hotel_reviews_newport_bay.pdfIn PDF document text
    • http://hookup157.fun/descargar_gun_strike_shoot_killer2z7bg.pdfIn PDF document text
    • https://cdn.sqhk.co/muzorefu/ciejjid/virgin_pulse_rewards.pdfIn PDF document text
    • http://fishland.store/photo_studio_around_witbank0xsrb.pdfIn PDF document text
    • https://patinijogu.weebly.com/uploads/1/3/4/8/134854147/vobod.pdfIn PDF document text
    • https://cdn.sqhk.co/nivodoruw/adliaug/19132084887.pdfIn PDF document text
    • http://madewithsunshine.com/8410866047595ls1.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/kuxuxemu/dilbar_janiya_song_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/m._ed_admission_form_uos.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/the_boyfriend_list.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/rosekuzedisatuzevewegav.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_off0000e102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE102 5340 bytes
SHA-256: 3f2b78fa514ab8391ba5f4a5addae87f5460aa4160ac7909fd00266607be837a
font_01_sfnt_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 10624 bytes
SHA-256: c8f843dee9fb03873e27e7c8abb071ec8febf8fbd87936f0958becff80e3f5fa

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