Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0135dd1774e2d8…

MALICIOUS

PDF

67.9 KB Created: 2021-02-11 20:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 60c7a8a77bd07f463df2d21a469eb935 SHA-1: 797d37f097d0e01e69a5b7767410078881346ad2 SHA-256: aa0135dd1774e2d8d03d8d97fd8f544bc4c8ff5ac83ed69a44d2f2f108158b0d
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to a link farm, a common tactic for phishing and malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a malicious intent to obscure the final destination. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML classifier's high confidence score suggest it's designed to lead users to malicious content, likely a phishing page or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/wix?keyword=saab+95+owners+manual PDF link annotation
    • https://cdn.sqhk.co/kagaxavog/BidLlGH/jump_start_car_service_adelaide.pdfIn PDF document text
    • http://formverifiedbadge.com/sisisojuxozerubanekudakokwp394.pdfIn PDF document text
    • https://cdn.sqhk.co/jebavimot/cZicNlz/78824936496.pdfIn PDF document text
    • http://salearea.pro/9641016045738ruy.pdfIn PDF document text
    • https://cdn.sqhk.co/tokebamojos/ijMigUX/ice_rage_hockey.pdfIn PDF document text
    • https://cdn.sqhk.co/xijodepub/bLjjjjt/99025941175.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453335/normal_5fec132250a6c.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/hjiecDi/bajinunivajixexikifodu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404287/normal_601739079ba19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://werolalijatet.rf.gd/fundamentals_of_nursing_study_guide_9th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/bewars_telugu_movie.pdfIn PDF document text
    • http://desibevazivoxan.rf.gd/travel_budget_calculator_template.pdfIn PDF document text
    • http://lepalatibig.epizy.com/81433067136.pdfIn PDF document text
    • http://xifabemifuxiza.rf.gd/5168043562.pdfIn PDF document text
    • http://nabunuwo.epizy.com/lagu_alangkah_indahnya_hidup_ini_veve.pdfIn PDF document text
    • http://keputeka.epizy.com/vawojuwabimogezow.pdfIn PDF document text
    • http://gegukisakewomo.rf.gd/developer_options_android_7.pdfIn PDF document text
    • http://widurema.epizy.com/algebra_examples_with_solutions.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_off0000cd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8A 5444 bytes
SHA-256: 6163dc8cb71801c416c5eab49449f201a42188a0a1236b7c5a4abb383b6fa557
font_01_sfnt_off0000e00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00A 10168 bytes
SHA-256: c8c3917dde2529f6d4eb3402b130ab068df9789c39366d34b08a812d753a560a

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