Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b83c9d3acd0a37d…

MALICIOUS

PDF

84.4 KB Created: 2021-01-15 10:40:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 67f86c21fe3927e4ee363a3120a51489 SHA-1: 807d3c751017f9c23707d53fce279ba8b01c722f SHA-256: 3b83c9d3acd0a37d13d5657b738aec0224ada54fe072b6940215a47e06e74614
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=riyadus+salihin+pdf+melayu In PDF document text
    • https://zenovoruzunej.weebly.com/uploads/1/3/4/3/134339910/nesexanafadebikono.pdfIn PDF document text
    • https://miburinu.weebly.com/uploads/1/3/4/4/134464577/mewebu.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/kifevi_miparotikopu.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/bijagilutomifu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377101/normal_5fc72a79c953c.pdfIn PDF document text
    • https://zobejonimofov.weebly.com/uploads/1/3/4/3/134354570/sopovo.pdfIn PDF document text
    • https://namosupegu.weebly.com/uploads/1/3/4/3/134313644/fedututofoluji.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/fflhaij/the_clone_wars_season_3_review.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/tetofamuxulil/zafuvip.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/mafanepa.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/trimmer_joist_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/legendary_animals_red_dead_redemption_2_guide.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011e1b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11E1B 21664 bytes
SHA-256: b5b942f4b7cfeebb4ce0bfcdd5f3f150808ea596640e3214eff2b93ba2df3837
font_00_sfnt_off0000e6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C3 5292 bytes
SHA-256: 09efae7c233147e688708853732327efa69b501b0abd758581bbf5d2d89d5461
font_01_sfnt_off0000f8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 11696 bytes
SHA-256: 0a546497bfda7deef8fbcc9ac60f14815303209cf95377e7df13859b4554ac5c

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