Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9efef44f1c0e3f…

MALICIOUS

PDF

74.9 KB Created: 2021-04-08 07:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9ea7a0b08f0654c8c54d8082c56847a8 SHA-1: 27ba0c9e5103908dd1bf519b76b89cf22a8dbd95 SHA-256: ab9efef44f1c0e3fdd5616c53857b043f0177941d1cd437e9b378a860f3a2168
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/123?utm_term=puzzle+games+android PDF link annotation
    • https://cdn.sqhk.co/pabelewexo/Hjfgghi/sdg_game_mdf.pdfIn PDF document text
    • https://cdn.sqhk.co/gelowidabik/rggdn7R/meloxufevemazijubozur.pdfIn PDF document text
    • https://dobojadu.weebly.com/uploads/1/3/2/7/132711966/1274675.pdfIn PDF document text
    • https://cdn.sqhk.co/polidupokasu/cjjQHje/9798264050.pdfIn PDF document text
    • http://jushq.pro/coleman_gas_furnace_limit_switchda3ni.pdfIn PDF document text
    • https://dinomorozowi.weebly.com/uploads/1/3/4/6/134610364/6b5ff10955.pdfIn PDF document text
    • https://cdn.sqhk.co/zirevazul/hgig5oD/56708134805.pdfIn PDF document text
    • http://kijubol.iblogger.org/64440821758.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/85170603324s8qhq.pdfIn PDF document text
    • http://tusapet.iblogger.org/lepejawobumijekusoku.pdfIn PDF document text
    • http://pezozolagipiv.22web.org/52046371824.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/jfjbgds/minecraft_tutorial_world_seed_switch.pdfIn PDF document text
    • http://dvestideyli.xyz/vogamadibqyjvm.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/69eddd13-4264-4543-b557-7a6ebb3ab41e/kunugakutavumajuponuben.pdfIn PDF document text
    • http://mubapumasas.epizy.com/jobuvek.pdfIn PDF document text
    • http://kevulapoxokimif.rf.gd/79189181861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a60bfee-276f-46af-97e4-1d31df2a9f10/tekuwe.pdfIn PDF document text
    • http://xarinibobi.epizy.com/benzodiazepnicos_lista.pdfIn PDF document text
    • http://vaxabusegaw.epizy.com/7th_birthday_invitation_template_princess.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d49398d6-4a14-4cf7-9620-8546a63fffbe/52868710019.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_off0000e91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91F 5196 bytes
SHA-256: 2ca1c4d5d7309a7f913bc110cacb847fe5ead9853be7925fc8b8ae4c1e8441fe
font_01_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 10316 bytes
SHA-256: 139d5da39d8705bf55605785fca5f370003735b76be1e72d48207f0eb215bcda

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