Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a29b36b682be76f…

MALICIOUS

PDF

78.9 KB Created: 2021-01-27 00:28:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2f6f05bc5bd6d96fb38204c7c39fea43 SHA-1: ca4811df4b696bf19464e36fbca9ff48818ca0c3 SHA-256: 2a29b36b682be76fb82a7f3fe72d7f227f7cd5b8c63d5013f3c66f26170e973a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm, with many hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, suggesting a redirection mechanism to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=fox+chase+regional+rail+sunday+schedule PDF link annotation
    • https://bokowamimufap.weebly.com/uploads/1/3/2/7/132712050/f597426bd.pdfIn PDF document text
    • https://fakegegi.weebly.com/uploads/1/3/5/3/135312823/d3a4a6.pdfIn PDF document text
    • https://pazijovipa.weebly.com/uploads/1/3/4/3/134327002/e9a177.pdfIn PDF document text
    • https://cdn.sqhk.co/sapidefapo/irC8id6/motorcycle_wallpaper_desktop.pdfIn PDF document text
    • https://cdn.sqhk.co/gikunixa/ghhfjga/beyblade_burst_colouring_pictures.pdfIn PDF document text
    • https://zunepijubu.weebly.com/uploads/1/3/3/9/133986973/f6bd3.pdfIn PDF document text
    • https://losuwasujiro.weebly.com/uploads/1/3/1/6/131637226/nebatufepepimuw.pdfIn PDF document text
    • https://cdn.sqhk.co/mukujoripu/hhjbmKG/ultralight_airplane_for_sale_near_me.pdfIn PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/lubusafoxewawek.pdfIn PDF document text
    • https://wawogikaso.weebly.com/uploads/1/3/4/7/134726687/zikagodaz.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/fihsQjg/vector_full_game_mod_apk_free_download.pdfIn PDF document text
    • http://poguferuliwu.iblogger.org/severe_ulcerative_colitis_treatment_guidelines.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/wivunonovef/89670872384.pdfIn PDF document text
    • http://sowinoto.epizy.com/xexigiserijofife.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/chitralahari_telugu_movie_songs_now.pdfIn PDF document text
    • http://xujiwusa.epizy.com/fubesoxozomuwoduxuveniz.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/all_airport_codes_in_the_world.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/vorufisofilos.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/google_drive_link_wget.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_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 5328 bytes
SHA-256: 62a147f47c96dd960ca5b9c47362bf544214cae43a35aea83f2122d0763280f5
font_01_sfnt_off000108cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CF 11120 bytes
SHA-256: c0e659f21949d430a1404292c0d3caf5c7193cb4993f0e295120beeff91ea87c

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