Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd133afdf53e8ee…

MALICIOUS

PDF

68.0 KB Created: 2021-01-09 17:31:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab19dee24fbcd25c8f3d833f14db6386 SHA-1: 75f6a7dcb5fe724ec8b82e990da8142f5963089a SHA-256: 5cd133afdf53e8eec9e67746b2fd1985189b0798949e62f32425e418ebfe08ad
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=sample+clerk+of+works+report
    • https://xuxixoxeniti.weebly.com/uploads/1/3/4/5/134585484/2897601.pdf
    • https://cdn-cms.f-static.net/uploads/4370540/normal_5f8a4c7e81085.pdf
    • https://cdn.sqhk.co/vafodagusun/eoQbWjj/electronic_pilot_logbook_free.pdf
    • https://cdn-cms.f-static.net/uploads/4383568/normal_5fe7c41b4e4e2.pdf
    • https://cdn.sqhk.co/kifavubivelo/ii11jeR/the_walking_dead_season_10_midseason_finale_date.pdf
    • https://cdn.sqhk.co/febutatesu/jbgihje/39143199970.pdf
    • https://cdn.sqhk.co/guwuweri/20gj2rf/33317304976.pdf
    • https://bipotanerazufis.weebly.com/uploads/1/3/4/5/134597687/6083795.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gonima/vw_tiguan_allspace_spec_sheet.pdf
    • https://s3.amazonaws.com/tomaxade/21131008745.pdf
    • https://s3.amazonaws.com/libusamagowuvo/cover_adlani_rambe_seberkas_sinar.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccbc.bin
968fc7f1d5b8515927972968ffa606ac370c5d790cb2474e0b5f6e64556f9313
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBC 5420 bytes
font_01_sfnt_off0000df2b.bin
436a23da134c2402505b70a1390d78912c18cec26f8e55b1c569122f1265e7e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 10620 bytes