Malicious PDF — malware analysis report

Static analysis result for SHA-256 86613d5781485195…

MALICIOUS

PDF

77.2 KB Created: 2021-03-20 10:20:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d86705ebe4294eac934a984a9022cca2 SHA-1: ab9234cbbfedf0e268ea68c970ef58940cf72e94 SHA-256: 86613d5781485195de655be7c37eeda72665b044e78a69ab2821f8d6c563ec8c
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to 'Othello study guide act 1', which is likely a pretext for phishing or malware distribution.

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://xezojetit.ru/wix?keyword=othello+study+guide+act+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406482/normal_602925d01e53d.pdfIn PDF document text
    • http://wosurijegu.22web.org/xakababurewof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468871/normal_5fee4ffe5ebc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448733/normal_6015a9d19c326.pdfIn PDF document text
    • http://ramidavukul.medianewsonline.com/creative_writing_exercises_for_dummies.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390324/normal_604aa6fe15dd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445532/normal_5fca40e77339f.pdfIn PDF document text
    • http://gachihyper.xyz/the_way_of_the_masterzv3sl.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/camino_de_santiago_frances_mapa7oj7r.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/environmental_awareness_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403274/normal_60438ff6a4711.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473379/normal_5fecc966ddd45.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/cadena_de_valor_concepto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470972/normal_601fd9958c2ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bakevojedu.epizy.com/56529465667.pdfIn PDF document text
    • http://pezefaxovojole.atwebpages.com/50201819377.pdfIn PDF document text
    • http://jurizamumi.myartsonline.com/fusionner_images_en_logiciel.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_off0000eea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA2 5284 bytes
SHA-256: ad19b367387beb85f3d02238375f79f66df664376ad3da69ce7eea5e79bc1aa6
font_01_sfnt_off000100a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A4 11024 bytes
SHA-256: 68ad2efde802ccdde8da4c827366b7c01d343faa2c22250e1d1fc33217b4d48b

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