Malicious PDF — malware analysis report

Static analysis result for SHA-256 0654e75ca0bf86fb…

MALICIOUS

PDF

69.2 KB Created: 2020-11-16 12:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: abc624e60f28d3e8221c9fb7770004e6 SHA-1: d2a19075a8f72629cc17233ed6212341dadd77bb SHA-256: 0654e75ca0bf86fba4dfce31ce79de16b72dbe31343e9b6529b79aa4244767ef
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of these links, https://trafffe.ru/123?utm_term=another+cinderella+story+cast+ages, is flagged as unknown reputation and is likely the primary malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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 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://trafffe.ru/123?utm_term=another+cinderella+story+cast+ages PDF link annotation
    • https://feresaxeto.weebly.com/uploads/1/3/4/6/134609658/jabepativolug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406455/normal_5f9ab02adf2f6.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/pulavokaxe/acca_f9_becker.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/60364732194.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/illinois_lottery_post_daily.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/40087237926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9e7981d-f571-41f8-ba26-37b4c4d3094b/isabela_zip_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4adef61-7b03-46a9-8eba-8d38cebe136a/lamimumivurota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec9d3f1-6a93-4844-98dc-7058b7ba2c25/21566085393.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/digital_signage_design_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9fdfb40-cbd3-4523-a71d-b62a47e8ae72/uic_academic_calendar_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8ca0fd-95c3-4821-b93d-30bdb9197ebf/jane_eyre_study_guide.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_off0000d187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD187 5292 bytes
SHA-256: 9f63fc2b5c661022da7d2fa5c6cf78896b6c250414a921aabbdf38f27a955fbd
font_01_sfnt_off0000e389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 10780 bytes
SHA-256: f5b3fe3f0014c1c693c5276ee706ac3ff8e168e9c2500ee0d8bbac4b4de0c402

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