Malicious PDF — malware analysis report

Static analysis result for SHA-256 482a227ad07187c9…

MALICIOUS

PDF

76.6 KB Created: 2021-02-26 17:01:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a2889803c065197df87996064d1c0865 SHA-1: 9781f71b1c7e4c763b57e90b82647a78d8f1248d SHA-256: 482a227ad07187c95af88afa3f26dfe11c54bcd67d6683b5efbd840c6af42ce7
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs 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://gimoguvi.ru/123?utm_term=how+to+identify+different+types+of+diodes PDF link annotation
    • http://brumbum2.xyz/68528316734y4t8t.pdfIn PDF document text
    • https://jurefuzosapob.weebly.com/uploads/1/3/4/9/134901670/6d0f6e2488f48.pdfIn PDF document text
    • http://meriline.store/52605493865uessc.pdfIn PDF document text
    • http://itasummer.fun/psicodiagnostico_clinico_del_nio_4tbip37.pdfIn PDF document text
    • http://reweder.site/daradezuxizunifamuvaxabel7w1lr.pdfIn PDF document text
    • http://f13x.xyz/musarogululidopeudneq.pdfIn PDF document text
    • http://santand-es.com/j_a_c_ka_full_formf6yw8.pdfIn PDF document text
    • http://converstarget.ru/silunuwuloberoxu4gobl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sajonagot.rf.gd/nujogux.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/16238454509.pdfIn PDF document text
    • http://raninidifawem.rf.gd/1170399351.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/load_static_file_in_django_template.pdfIn PDF document text
    • http://mowowaruxuxizim.rf.gd/aurum_blade_mod_apk_latest_version.pdfIn PDF document text
    • http://janaxoz.epizy.com/mopegotolumapur.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/atmel_studio_7_user_manual.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_off0000f0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 4948 bytes
SHA-256: 42720ab6960d8bd59c03a28b361843ca8bed94cf8434337e3c65aa5d5ec348e3
font_01_sfnt_off000101f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F7 10680 bytes
SHA-256: 13817d5f2f46a692db31a7128755c7d6a63cd3b3481d5ac873c4e6ec80a242ed

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