Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36c4b9b2cf78d62…

MALICIOUS

PDF

85.4 KB Created: 2020-12-31 02:42:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b48cb95c3327edca07220b00430387d1 SHA-1: 2b740dcff34bdb31a4aa47787156cb763cd6528a SHA-256: d36c4b9b2cf78d625b460686a48931b63ffd9c6cc880060e24936856f8162990
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains text related to 'Zpu- 4 anti- aircraft gun firing', likely intended as a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://ggtraff.ru/strik?utm_term=zpu-+4+anti-+aircraft+gun+firing In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371806/normal_5f9d6917873f5.pdfIn PDF document text
    • https://cdn.sqhk.co/zivudasexoni/jhLaihd/rubud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419827/normal_5fad36b5c21a8.pdfIn PDF document text
    • https://cdn.sqhk.co/kafevinuva/bheNuId/867383562.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/27f066bf-97e5-4c7d-8a88-4cacaf9299dd/vowewaxaruvomo.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/jamarojuxejadujezi.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/pinadiverisidasonalesidag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d820a080-0d65-46e4-ae15-f457340d1684/caterpillar_c15_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/animal_welfare_act_of_1966.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/best_free_indesign_magazine_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/carrion_comfort_dan_simmons.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/duzek.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/jumujixujev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d83b610-d845-4d9a-bbe6-b31de601a0c5/persona_3_kenji_reverse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7d18f22-c0ac-4efe-8903-1b35b5ff45f1/25264010289.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BD 5052 bytes
SHA-256: b693106c97a412b171690d86ac086b3bbe2c71857b9202ea93ab8acfaaf4f61e
font_01_sfnt_off00011612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11612 15284 bytes
SHA-256: af3ce64214e8e89e84499f05eda46ae6a54fab5c530928f646aace94d344a6f2

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