Malicious PDF — malware analysis report

Static analysis result for SHA-256 5205b5b91ab58fa0…

MALICIOUS

PDF

73.1 KB Created: 2021-04-30 22:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4a4de86fea3b93ef29dc75d5179e6a4f SHA-1: 592ee0d6b90df9be8926554cb6b4e1e6defab11e SHA-256: 5205b5b91ab58fa0a8555ddb8d896a9248affe8878d7381ba20134aead6dadf3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/strik?utm_term=ejercicios+matematicas+2+eso+operaciones+combinadas+fracciones PDF link annotation
    • https://mixidesurujof.weebly.com/uploads/1/3/4/9/134902607/9902014.pdfIn PDF document text
    • http://basagutidabe.sportsontheweb.net/adhyatma_ramayanam_kilippattu.pdfIn PDF document text
    • https://tojalalegeb.weebly.com/uploads/1/3/4/5/134584715/0bb3f6.pdfIn PDF document text
    • http://luxenerox.22web.org/veronica_roth_four_download.pdfIn PDF document text
    • http://nuvagefo.medianewsonline.com/85892147500.pdfIn PDF document text
    • https://cdn.sqhk.co/nowagenika/fgcIbhf/amnesia_memories_toma_cg.pdfIn PDF document text
    • https://batigagonu.weebly.com/uploads/1/3/4/7/134774980/jexejovixubewita.pdfIn PDF document text
    • https://satisetuxa.weebly.com/uploads/1/3/0/8/130813646/21f19f1efd3f.pdfIn PDF document text
    • https://cdn.sqhk.co/woberimi/fgeiasj/64542394582.pdfIn PDF document text
    • https://cdn.sqhk.co/delopomixaba/qgejbjh/formule_1_2018_gameplay.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fodose/is_an_executive_assistant_higher_than_a_manager.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/wizesoxudixaxedimuniso.pdfIn PDF document text
    • https://26b54b0d-7067-4615-bd5a-e9f638bc9197.filesusr.com/ugd/26f5b5_e99ba16cb7e046078ae81d45738fdf96.pdf?index=trueIn PDF document text
    • http://noxumalog.onlinewebshop.net/64710383709.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_6dee2227574c4025a0a75eb14d1b5c99.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/papubizigas.pdfIn PDF document text
    • http://dibirat.rf.gd/xixapamo.pdfIn PDF document text
    • http://xoxigibutu.epizy.com/periodic_table_charges.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/kitulusopojopeleze.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_off0000da74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA74 5572 bytes
SHA-256: 9c8f8404e10b0e2c84d8adf3067a35fa5f125d0aae0e4bb4296db960c7a87a2f
font_01_sfnt_off0000ed50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 12984 bytes
SHA-256: d638a7091284f4940cc3a0ed6154f41c02281d554c059892a70c09e28d2a011d

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