Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c736a8e000de059…

MALICIOUS

PDF

79.5 KB Created: 2021-02-22 05:40:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7f9551d22316b7e4d1b5e394b5fd208b SHA-1: 83ea4fbbfa56bd207a833f4159068a4bca9055a2 SHA-256: 9c736a8e000de0596cecec3988514821653c534f74106b88d33aa01947f586a2
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide malicious content.

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://jottigo.ru/123?utm_term=what+is+coming+to+disney+in+2021 PDF link annotation
    • http://naturalik.fun/causes_of_hyperinflation_in_zimbabwefq8um.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/mvQ5hdC/who_sells_bingo_cards_near_me.pdfIn PDF document text
    • https://depasosuva.weebly.com/uploads/1/3/4/4/134483816/91673944.pdfIn PDF document text
    • https://cdn.sqhk.co/javepuju/jUFigc4/your_dance_avatar.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/tnt_mods_for_minecraft_1._15._2h633j.pdfIn PDF document text
    • https://cdn.sqhk.co/dulidara/PjcpWYD/keguxabiguwadarewuroba.pdfIn PDF document text
    • https://gijojipile.weebly.com/uploads/1/3/1/3/131381352/875698.pdfIn PDF document text
    • https://fevebelok.weebly.com/uploads/1/3/4/0/134012800/vatuvefuxigoro_sojovopasaka_nilasikutevubi.pdfIn PDF document text
    • http://ruzagasaz.iblogger.org/92215330850.pdfIn PDF document text
    • https://cdn.sqhk.co/gitogozune/bfxvGkc/world_war_z_game_ps4_cex.pdfIn PDF document text
    • https://cdn.sqhk.co/xasexuwosul/hebZTig/fivosefilubugidoxefo.pdfIn PDF document text
    • http://mugaset.22web.org/traductor_ingles_espaol_gratis_reverso.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/WjjqggB/halloween_party_ideas_for_tweens_2020.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/daxemo/spherical_bessel_function_fourier_transform.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/zasulinipibuwel.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 8

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_off0000f858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 5664 bytes
SHA-256: 541ac80bb30d64f9c5105fe07ee3b0be8b70e4d362ff4b15941f203c4cf5001e
font_01_sfnt_off00010b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B92 11036 bytes
SHA-256: 876666efbcb38280b2fd6fd8bf3895c65b431f4dc557c7a04663d042d49f90b2

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