Malicious PDF — malware analysis report

Static analysis result for SHA-256 9834c964961805f3…

MALICIOUS

PDF

68.5 KB Created: 2021-03-13 22:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f516c8b7109d4f2bfcfb2ddbc0436a16 SHA-1: 15f06c607cda318ff1b6147e0d04a440d64771b7 SHA-256: 9834c964961805f32bae0466f5d6ae5177682799205044ccde8ffc4bd1ab736f
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/wix?keyword=compare+and+order+positive+rational+numbers+worksheet PDF link annotation
    • https://kololopobiro.weebly.com/uploads/1/3/4/8/134853362/dajado.pdfIn PDF document text
    • https://laduvozonos.weebly.com/uploads/1/3/1/4/131408864/zaxaporibowam.pdfIn PDF document text
    • https://jalizirut.weebly.com/uploads/1/3/5/3/135308553/pumirefifuganud.pdfIn PDF document text
    • https://kikosezuzo.weebly.com/uploads/1/3/1/3/131378972/gikev-jamumigapakopa.pdfIn PDF document text
    • https://xuzumuja.weebly.com/uploads/1/3/1/6/131636792/6520a725abc36.pdfIn PDF document text
    • http://faxozulakevosos.iblogger.org/95555434142.pdfIn PDF document text
    • https://nimidakotogala.weebly.com/uploads/1/3/0/8/130874585/3561202.pdfIn PDF document text
    • http://dujegud.getenjoyment.net/70722301559.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sujevulakaginig.rf.gd/banilewenudaxejarawojuvaf.pdfIn PDF document text
    • http://zegetafirotazaz.atwebpages.com/bijodukerovemukifejutidop.pdfIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_ab073078c7ad4f73a7fb49f6e53b4a10.pdf?index=trueIn PDF document text
    • http://zefupolegemawak.rf.gd/magic_mouse_2_gestures_ipados.pdfIn PDF document text
    • http://vedebimefawimad.rf.gd/interview_questions_for_mental_health_nursing_at_university.pdfIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_10d3020fa0d64795acf5cc0aaf417ccc.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_38511e3ea49c4937a578bf9e5325cf71.pdf?index=trueIn PDF document text
    • http://sobezoneroli.epizy.com/dumov.pdfIn PDF document text
    • http://nojumajemipi.rf.gd/ego_lawn_mower_repair_locations.pdfIn PDF document text
    • http://tosawivigibi.rf.gd/bimusutadiluwadinuligu.pdfIn PDF document text
    • http://godolefimew.epizy.com/33519473680.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_off0000ce3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3F 5460 bytes
SHA-256: ccd97acc3940c63b621d768e2185ded61940493c197f6ea7608f55a28ea1a4a4
font_01_sfnt_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 10480 bytes
SHA-256: 92c53285bcb17f0641564953dd634b3d9c50fa3de6652cf836fa9b9620f6e0cb

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