Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b8eabaca30c190…

MALICIOUS

PDF

99.7 KB Created: 2020-11-20 19:26:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 21465fd5ee0bf84ba9902e5ce2d2a93e SHA-1: 38c8485f14136c240f61aa83ae61170144317160 SHA-256: 05b8eabaca30c190da0b40f6bc24fc917f5430146decaf934dbca4f338a5078b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing sites, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The embedded URLs, such as 'https://trafffe.ru/123?utm_term=the+revenant+script+pdf', are likely used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=the+revenant+script+pdf PDF link annotation
    • https://devigumekumowir.weebly.com/uploads/1/3/4/3/134394761/zegewalumulufuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384154/normal_5fadf5deb7a8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f8d3eb45a664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415524/normal_5fa84dd69ed69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402246/normal_5f9114525232f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470019/normal_5fa630fc2484d.pdfIn PDF document text
    • https://jewelalebun.weebly.com/uploads/1/3/4/5/134585336/gijofalelege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377101/normal_5f9b3235363a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409630/normal_5fb37256c1e4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tinivukedeta/68890593111.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/71961990328.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/ptk_biologi_sma_kelas_x.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/605608731.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/intentionally_left_blank.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/preposition_of_place_exercise_with_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/guide_series_fly_fishing_vest.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/beginner_dumbbell_exercises.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D98 4900 bytes
SHA-256: 41d46ce8e40e804519f165c09bfc2d68161944fd23147f1deabe7f9233950937
font_01_sfnt_off00014e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E33 11252 bytes
SHA-256: 30f820c8b901ce529639c18d533453ab520472f3cc346a1f3ae4c8e3da43a08a
font_02_sfnt_off00017374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17374 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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