Malicious PDF — malware analysis report

Static analysis result for SHA-256 239d3f25b028deec…

MALICIOUS

PDF

63.4 KB Created: 2020-12-22 19:04:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 19a8bfea53dbb666d1800764555a54e9 SHA-1: 125428d09a7048d05355aafdbda914fbe03a101b SHA-256: 239d3f25b028deec3205d55ff0b66c8eed96b4502092583633e4da3380226037
156 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 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 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.
  • 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://traffine.ru/strik?utm_term=transport+tycoon+like+games PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374963/normal_5fd2534bc2c7c.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/devugiwofutuvava.pdfIn PDF document text
    • https://sebumeganajili.weebly.com/uploads/1/3/0/8/130874272/zaxafonokobaromut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454967/normal_5fb29004b99e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373519/normal_5f9dc439e268b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379385/normal_5fbb092d33bfd.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/bulozor/mindtap_answers_macroeconomics_chapter_3.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/tropical_storm_karen_forms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c3fc3c3-c692-4716-9726-ebd8352b7c18/16530105425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e05dd110-7d40-4780-8e56-740d4b21f1d6/12361321497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e098cb99-b372-4bb6-ae12-315c75959221/kepagitejow.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_off0000bbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFC 5368 bytes
SHA-256: 9f8e5b15845f382757115daa784129ce0a5ffde1de49d861b2847ac68e253750
font_01_sfnt_off0000ce39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE39 10204 bytes
SHA-256: 696161428dcaf6d1a1f7b9dfccb54a799cd06652427fe2b1f5261e82834a3f43