Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c1d08ede29de67…

MALICIOUS

PDF

57.1 KB Created: 2020-12-18 11:23:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: add66aca1e2840d8463145134bc02d73 SHA-1: 898123af1a35e22742d38fca891d1a985be52194 SHA-256: 04c1d08ede29de67199ac2af6b9aa30babe4b7180c6633d442d2fbe1dc5edd60
176 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable action. It contains a mass of external links, including a suspicious URL pointing to trafffe.ru, which is likely used to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 57 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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/strik?utm_term=kobalt+socket+set+lowes PDF link annotation
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/vimimijidife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495681/normal_5faec8a474706.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408589/normal_5fcc83618a555.pdfIn PDF document text
    • https://widuboxizivibib.weebly.com/uploads/1/3/4/3/134315701/pepok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408588/normal_5fa75d1439121.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489716/normal_5fc81381cc360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424982/normal_5fc34ced520a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457330/normal_5fd1bd7e0f863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_5f90345af20c2.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/mikibetiv/loud_house_episodes_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/reruwenabalijab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87090060-e80f-424c-8a7c-5bf04c6996d3/postal_envelope_sizes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6626ae97-e800-42ce-8b17-6dac5bb27468/54977500378.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/xejemudugovewedejofewi.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/sinizadun.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/apache_maven_plugin.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_off0000ac54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC54 4960 bytes
SHA-256: 20366d33c267bc8d58d00a2c39c9f04ee5f0a5e7657a73d76cdbf829d54ee5ed
font_01_sfnt_off0000bd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5B 7688 bytes
SHA-256: ebd779b8159eebbf53284afaeaeeb7014cb2298fee55e8057c935d2357700138

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