Malicious PDF — malware analysis report

Static analysis result for SHA-256 67bfda1f00fddb99…

MALICIOUS

PDF

81.0 KB Created: 2021-03-10 01:54:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9982f632522966e407e69d4d54ebeb30 SHA-1: 2b21f38c74d6a2cb592d7363ede4621a5475179e SHA-256: 67bfda1f00fddb990f83957fe00f566ea6dea97b4c2b6c146eadecc9c07bc15e
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to 'chemistry chapter 7 study guide answers' and 'wkhtmltopdf', likely serving as a pretext to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/wix?keyword=chemistry+chapter+7+study+guide+answers PDF link annotation
    • https://mifesala.weebly.com/uploads/1/3/2/6/132683173/balepono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367920/normal_60338f2d10080.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382784/normal_5fc87acc910d8.pdfIn PDF document text
    • https://lejegibovijidup.weebly.com/uploads/1/3/1/4/131438293/jojotedilos_rukega_dedenufox_sugogisom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490141/normal_601888e1998b9.pdfIn PDF document text
    • https://cdn.sqhk.co/perolurowona/ihhavii/battleship_online_with_friends_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/mudonisogub/ibO3Yje/sufupirufeta.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/iihh5ia/55424395228.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381095/normal_5ff1c263cf351.pdfIn PDF document text
    • https://vegebawijinewer.weebly.com/uploads/1/3/2/7/132740558/simimamofo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366949/normal_6025f36a84499.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/jhhjghj/reversion_clause_real_estate.pdfIn PDF document text
    • https://somubafe.weebly.com/uploads/1/3/4/4/134444697/pawijot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415061/normal_5fd98d4856bde.pdfIn PDF document text
    • https://tofexozulemun.weebly.com/uploads/1/3/0/9/130969243/xodaruzoguliza-tewifuxufo-xaduvo.pdfIn PDF document text
    • https://suvosimi.weebly.com/uploads/1/3/4/6/134688706/volugerenam.pdfIn PDF document text
    • https://borerejo.weebly.com/uploads/1/3/4/0/134040615/bac62f4d4b25062.pdfIn PDF document text
    • https://zusikemibuv.weebly.com/uploads/1/3/1/6/131606719/0c24117c5d22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460465/normal_60182c7b74b46.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/nelusogulazodaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9e51f22d-be3c-435f-895f-4864846c4c3f/fozadijologumaxawepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/858efea6-2025-45a4-97f9-c8fee55a87a8/8226619048.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 5524 bytes
SHA-256: fd934bc58231b7a0a103f50a8a304f9bdce84baee434bf9f2e4e9b5ac685cb8f
font_01_sfnt_off0001041a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041A 10492 bytes
SHA-256: 51716911e5fbb621dd3ceccf28def812855046ad68f1ebec2e74758ef92cefbd
font_02_sfnt_off000127fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FE 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34