Malicious PDF — malware analysis report

Static analysis result for SHA-256 929924ad6f22b2c9…

MALICIOUS

PDF

101.9 KB Created: 2021-02-27 11:49:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: bfbc943d3ffe12e99da88e096c0eccf2 SHA-1: 4f5fcf74628b0d9ebd67f013a65bc891d1d36f9e SHA-256: 929924ad6f22b2c96ec0442a9738f317e99b0c330080d23228093fba2101bc16
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration on disposable or low-reputation domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://ponafet.ru/award?keyword=death+note+misa+amane+age PDF link annotation
    • http://xenalebosob.scienceontheweb.net/2756401857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445334/normal_602ec81b21c7b.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/river_flows_in_you_guitar_notes.pdfIn PDF document text
    • https://lozagazol.weebly.com/uploads/1/3/4/2/134266804/boxotilibanuso.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/12541284455.pdfIn PDF document text
    • http://xavelodezazil.iblogger.org/design_and_analysis_of_algorithm_tutorialspoint.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452837/normal_5feceaf6dd131.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/bright_line_eating_meatball_recipe.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/nulimumazudobivokuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pojozija.onlinewebshop.net/mountain_athlete_barbell_complex.pdfIn PDF document text
    • http://korimuf.epizy.com/64037217980.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13134 3964 bytes
SHA-256: bb5cb8401caefdfc1d14755514f71a99769d6b06ca1800ac60b15879014a5a8e
font_01_sfnt_off00013f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F37 4968 bytes
SHA-256: c9fab1b77d0fcb0c6d2cdacd617a3d14342654c688f2fa2925afa3807c25cc1e
font_02_sfnt_off00015005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15005 10592 bytes
SHA-256: 3e7dabc65a6b14b2fcacf7f3df49202a608daa584dfaf40a9b3f8f56641f7b71
font_03_sfnt_off00017457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17457 16320 bytes
SHA-256: 2011fbb644e341a00b232202af8eae869d0acca1277d1ee6c644270f92ef2640

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