Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c38676b438d95bc…

MALICIOUS

PDF

74.9 KB Created: 2020-11-24 10:24:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5d10b4eb9da45b0cf42aa1968c49c428 SHA-1: 20911c991b4372d7514ca756aabb3a216a2bd7a2 SHA-256: 1c38676b438d95bc0f0e863eae082956aa90b653fe625de8562a90b581d430e5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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://traffset.ru/strik?utm_term=borderline%252C+narcissistic%252C+and+schizo PDF link annotation
    • https://kuvinonufero.weebly.com/uploads/1/3/4/3/134307364/2467875.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5f8923fbc0b6f.pdfIn PDF document text
    • https://lifezubolafa.weebly.com/uploads/1/3/4/7/134715310/32f34e3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387806/normal_5f9da66b209a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_5f8a5fff56fbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_5fbba012359f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471230/normal_5fb27b59415e6.pdfIn PDF document text
    • https://xeludelibiw.weebly.com/uploads/1/3/4/3/134371965/zepinido.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/penale/56893685614.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/16766341517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00b5fdf9-8433-4686-813b-6444bf8c2140/mugen_all_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/rolidarezoxotinonisukox.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/shack_hartmann_wavefront_sensor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea519a0b-942e-40d9-9664-ed2bcb716af3/yahoo_answers_girls.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_off0000e504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 5180 bytes
SHA-256: c332bfc2997b4bc5b899e430725aab9b50269df22642f2f7115c48743bf41cb2
font_01_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 12240 bytes
SHA-256: bb4c0ea51a411386c982f00ab0d6c8d60f70af776a0ce28d215dac77338e6fe1

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