Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb1a22c85d05571…

MALICIOUS

PDF

84.4 KB Created: 2021-03-17 05:29:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8bcabba7f01edd841aff427b8c1a90d4 SHA-1: efdc38443933cc05936a2e4b2c3a1390ad0a6963 SHA-256: deb1a22c85d0557145e25170fc5870ab4492da199cd1e571ca14b36d287e1e0f
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are associated with link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=how+to+change+hp+printer+ink+3830 PDF link annotation
    • https://gofikebome.weebly.com/uploads/1/3/4/8/134847018/buwisi-vimiwag.pdfIn PDF document text
    • https://cdn.sqhk.co/lumozupa/RCjoX4y/32065833010.pdfIn PDF document text
    • http://hydraruzxpnew4af.exchange/16560577813uuuua.pdfIn PDF document text
    • http://mabay.fun/how_to_start_making_money_on_twitch3a0xy.pdfIn PDF document text
    • https://welaxulisura.weebly.com/uploads/1/3/4/0/134042468/4ada5.pdfIn PDF document text
    • http://giveaway2020.info/free_bootstrap_4_templates_rtl07p29.pdfIn PDF document text
    • http://ctuxuu.com/juvilafatolanuxuxevf53vb.pdfIn PDF document text
    • https://gibiboxovozigux.weebly.com/uploads/1/3/4/7/134722082/zerikov.pdfIn PDF document text
    • https://cdn.sqhk.co/jalexire/WZijWWz/action_director_mod_apk_free.pdfIn PDF document text
    • http://yourbigdick.space/telehealth_by_simplepractice_for_macxsily.pdfIn PDF document text
    • http://100naturals.fun/60657365137ks3fv.pdfIn PDF document text
    • http://streamsweets.com/48451572438qhrgz.pdfIn PDF document text
    • https://gopaposoxawa.weebly.com/uploads/1/3/0/7/130740193/xurutagitikoga-sixugenubur-benewadobal-nuritu.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/349b7a74-a3d5-471f-8bd7-421d854bc8d4/software_project_management_an_integrated_approach.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9cc6015-dfd6-44d0-a38c-0e88056ca8c8/13240939760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/552843e4-9346-417e-b45d-96aec1ed1a7c/dodumesiv.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_off00010cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAE 5600 bytes
SHA-256: 4335187e4277bbe0c4c138cd96c69fb424fdbed6e4de2c028022c2be6f520f6e
font_01_sfnt_off00011fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCD 10952 bytes
SHA-256: 6b807dbd84291773b28ec488263e64bc68a8bf5ee50b9258a0e26efdcf816790

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