Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf3715f192d63be…

MALICIOUS

PDF

76.8 KB Created: 2021-03-01 04:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c4b8d9628fc157997fb4d2076a5ca29e SHA-1: cb855445586130587906227cbb6050d0f11a79b2 SHA-256: 6cf3715f192d63be12239d5510cacd62d4669486a1129149f4dec496b770678d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting or unknown domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded content, though obfuscated, appears to be a lure related to 'Hairspray musical details', likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=hairspray+musical+details PDF link annotation
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/xuvifuwabidukukuz.pdfIn PDF document text
    • http://abreudesigns.com/37101479451lei5v.pdfIn PDF document text
    • http://menbp.online/wujerujuvefugudadyn37s.pdfIn PDF document text
    • http://pop-marketplace.ru/through_the_wormhole_with_morgan_freeman_full_episodes0rzcq.pdfIn PDF document text
    • https://lekamenofujilap.weebly.com/uploads/1/3/4/6/134690267/kuvolox.pdfIn PDF document text
    • http://twoup-viktoria.online/xorotofulixajinibubutxrua4.pdfIn PDF document text
    • http://static-get.top/texas_am_galveston_meal_plans1jkki.pdfIn PDF document text
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/2419140.pdfIn PDF document text
    • https://zofigaxukinepir.weebly.com/uploads/1/3/4/2/134235574/zapex-loluvara-kofig.pdfIn PDF document text
    • http://creditinquiry.info/muxifavugeresukovuzajojwf4p3.pdfIn PDF document text
    • https://nigikejogu.weebly.com/uploads/1/3/4/9/134902550/rasasi_xuzijekuzuwit.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/kikunojulejuj/vogigipifatebuxotubazafu.pdfIn PDF document text
    • http://kezaforow.epizy.com/login_facebook_android_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/do_you_report_standardized_or_unstandardized_betas.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/68001786171.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_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 5280 bytes
SHA-256: 07ae54d5b2998516a67559b6bad084210f07098c351e6c1d9843e325e46ce00a
font_01_sfnt_off00010047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10047 11168 bytes
SHA-256: 386e423d1c007aaa69c61887700e0c7ac1ecff6db39685515dbaedc27ab1fa9a

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