Malicious PDF — malware analysis report

Static analysis result for SHA-256 653a8a5cf10e27fb…

MALICIOUS

PDF

65.8 KB Created: 2021-02-11 10:24:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 309dd0899dccdb2ad955f32d76096716 SHA-1: 3943c4e154b519fc8c55700613fc396bb59fb9e5 SHA-256: 653a8a5cf10e27fb69250b04025eae536a352b038bb2bec05b2aad14174e0ae8
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristics indicate it functions as a link farm, directing users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://jacksth.ru/aws?utm_term=wedding+budget+template+excel+south+africa PDF link annotation
    • http://mnatural.space/zosopijilulafevoluxegio3vb5.pdfIn PDF document text
    • http://appless.space/geometric_series_questions911li.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/7jdDLHv/57793456971.pdfIn PDF document text
    • http://roman-holidays.shop/instagram_influencer_collaboration_templatezkvyd.pdfIn PDF document text
    • http://tuimag.ru/nuzovovuvug7u6gt.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/vpn_ios_6.pdfIn PDF document text
    • http://gprofights.ru/8942614751648pbs.pdfIn PDF document text
    • http://deemonatrafik.xyz/descargar_gratis_bestiariole3jd.pdfIn PDF document text
    • https://cdn.sqhk.co/zumufapofow/ghhjiaN/73426242766.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zuses/beauty_plus_app_for_android_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/acta_constitutiva_sociedad_anonima_mexico_formato.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/mavad.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/15891162563.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/platelet_transfusion_guidelines_in_neonates.pdfIn PDF document text
    • http://latarugumajovi.epizy.com/34370514962.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/tedavolipupeporovikerusu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B1 5672 bytes
SHA-256: 5d8aa34abe6e7860e2696b4bd2c6e2c202693e3b9f9de1e2ed6f8640a57fce58
font_01_sfnt_off0000c9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D1 9948 bytes
SHA-256: 1827ce4bb7a75498407a13761b4f0d1b753ebe0a96f7aab58de05b923de229c7
font_02_sfnt_off0000ebee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEE 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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