Malicious PDF — malware analysis report

Static analysis result for SHA-256 c956fbd7916ab0ab…

MALICIOUS

PDF

74.3 KB Created: 2021-02-19 00:49:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6a9a1d83fef9d192cb3409eab4051e0f SHA-1: 2230fecf7a4ab48dc4441ef3c9f843584b48f7ac SHA-256: c956fbd7916ab0ab00cc00e254fd1e50daf61e4d108d4ff1d918ea141f3a7227
136 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious and a phishing attempt. The 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristic specifically indicates a lure for free downloads leading to an SEO redirector. The embedded URL 'https://seumenha.ru/123?utm_term=osha+safety+training+online' is the primary indicator of this phishing attempt.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?utm_term=osha+safety+training+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401723/normal_60145b5a1c7cb.pdfIn PDF document text
    • http://emmetrix.net/pretty_little_liars_episode_guidembi7g.pdfIn PDF document text
    • http://rolevuses.iblogger.org/jajemisilusuza.pdfIn PDF document text
    • https://cdn.sqhk.co/xukeposudexo/bbgeiaA/36519886074.pdfIn PDF document text
    • http://amst-watch-v1.club/563982408601qfxw.pdfIn PDF document text
    • http://genoray.pro/ideal_dzenin_olabileceini_kabul_ed6ky2f.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/CnigxyT/11656324493.pdfIn PDF document text
    • http://hookup158.fun/what_is_law_of_intellectual_propertybd7bv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420767/normal_5fee1b97c931a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/free_book_mockup_psd.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/28691606440.pdfIn PDF document text
    • http://mezezix.rf.gd/check_register_and_budget_spreadsheet.pdfIn PDF document text
    • http://rokodejufoda.rf.gd/65503680038.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/74202340295.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/37935116802.pdfIn PDF document text
    • http://vigevelo.rf.gd/casio_fx_991_es_plus_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/welutaz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 4948 bytes
SHA-256: 0a8f6db83a36439d45d46f093eb51f00fadd5a07a0481a52b8811e0394e05d74
font_01_sfnt_off0000eb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 10052 bytes
SHA-256: a5a1feada8de37a33764479411137a07a5ee7cbc4a1ad3cf9c672889c0030d40
font_02_sfnt_off00010db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB9 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c