Malicious PDF — malware analysis report

Static analysis result for SHA-256 280851f94a0c9a42…

MALICIOUS

PDF

79.0 KB Created: 2021-02-24 22:17:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a71f365e21e19a8e766b6d37047a9389 SHA-1: 8eb6453ccdd174f067de977721c3ff64d404476d SHA-256: 280851f94a0c9a42186562f0271b6be780501dcc26ddec065d49de1c44655c42
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to external domains, suggesting it functions as a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the phishing/malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=how+to+study+for+the+apush+exam+the+night+before PDF link annotation
    • https://zumegopepotiko.weebly.com/uploads/1/3/1/3/131398003/dokomigegasatizuz.pdfIn PDF document text
    • https://bajipupetezin.weebly.com/uploads/1/3/5/3/135315063/subufonalojiwo.pdfIn PDF document text
    • http://contentmedialiteracy.com/85264966192ceizl.pdfIn PDF document text
    • http://vash-komfort5.ru/bihar_police_syllabus_2017va8j6.pdfIn PDF document text
    • http://migerov.xyz/kakagogazomitidepo4ghbm.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/gelirafopeyezwj.pdfIn PDF document text
    • https://gujetorepirun.weebly.com/uploads/1/3/4/5/134502828/favexe_begasinapunegid_xuzev.pdfIn PDF document text
    • http://marketes.pro/persepolis_volume_2_summarysc4aw.pdfIn PDF document text
    • http://evilcheats.fun/19342670473pyox5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446496/normal_5ffc157bcd393.pdfIn PDF document text
    • http://lumacy.site/43930679803i5ze9.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/juzewojavomofew/how_to_block_android_phone_using_gmail.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/jefez.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 5784 bytes
SHA-256: 7624eee62e130b3c9bff5c5f132172e69da44c2bfc56decd87c6b28b32bf280c
font_01_sfnt_off00010a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6A 10820 bytes
SHA-256: 6baba8f10fed3e46c9eed3dc874d03eff93f280fada5744f17450d41a571db53

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