Malicious PDF — malware analysis report

Static analysis result for SHA-256 99966f51ca4cbace…

MALICIOUS

PDF

65.4 KB Created: 2020-12-20 12:15:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f51e329fd533efb9fcaae6b658f97e0f SHA-1: cc097e4c4fdd69c3551896480d4a5e0e8a357c27 SHA-256: 99966f51ca4cbace61cc33444140afaf1e61299cbb3ec77e1bd607d4e476c5a4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm and has been flagged as malicious by ML classifiers and ClamAV. It embeds external URIs, including one pointing to 'traffnew.ru', suggesting a phishing or malicious content delivery attempt. The document body, though heavily obfuscated, contains text related to 'sheep falling over' and wkhtmltopdf, which is likely a lure.

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://traffnew.ru/strik?utm_term=sheep+falling+over PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f870630cacf1.pdfIn PDF document text
    • https://sigakoge.weebly.com/uploads/1/3/4/4/134437147/pezunelimerezagunila.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403804/normal_5fa488d9f3e15.pdfIn PDF document text
    • https://sujoxiwu.weebly.com/uploads/1/3/4/8/134879933/e3fdfe0b.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/faxaxos/rodanuwemo.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/air_cargo_management.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/3901281176.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c9b1a5bc066edfa528b7/t/5fc20c50eaf37e3b64e35746/1606552657780/39897471293.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/alagendra_sollukku_muruga_cut_song.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0bbce18c5c478ec2ff0a/1606290365006/kefuviver.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/xogadixutovalesarizufis.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdcb81cb919dd0c3e451148/t/5fdce74d7a9d516f3cc225bf/1608312654068/jogepavatarudo.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_off0000c468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC468 5148 bytes
SHA-256: 92e238454777637b050c9f8c047521cf1ff3260fb03a3b6c6f393435df118e43
font_01_sfnt_off0000d5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F6 10476 bytes
SHA-256: 39a0742b9b709746a2ead79eecddd4d1e7f87418b0de0ab2d2d14f65e42a52c6

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