Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f3f7b60e8f6588…

MALICIOUS

PDF

67.9 KB Created: 2020-12-01 19:15:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f0778a9844908371871aff8b777c4006 SHA-1: 11f8048d8b90b9bc48c0cdd5d8ffba1c162c5028 SHA-256: 58f3f7b60e8f65881e70eacacc3f7ded12ada6ba990e5159fc33e1ffe8b8438f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attempt, likely leveraging embedded JavaScript for malicious actions.

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/123?utm_term=renton+school+district+salary+schedule+2018-19 PDF link annotation
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/sajedefogiputa-rotixiroru-mokifole.pdfIn PDF document text
    • https://gowubezu.weebly.com/uploads/1/3/4/4/134497845/foleposunixugex_zilanaboxadika.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/41443ac5147.pdfIn PDF document text
    • https://temoxemotedi.weebly.com/uploads/1/3/4/5/134599163/bubajibotif-ferori-serizetevakos-vaveririwugoxas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_5f8e30517a006.pdfIn PDF document text
    • https://zuzumapi.weebly.com/uploads/1/3/4/3/134344149/boxetuxesiv-devoj-somoburefarad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383444/normal_5f8b96e492803.pdfIn PDF document text
    • https://kaginugopaz.weebly.com/uploads/1/3/4/3/134310825/tuwasa-buzejebumu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc00c29085bf90c0ef85582/t/5fc11db75147b148045b773c/1606491576400/73509051308.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfac679c08c7f2b9ebe2d/1606220486428/87746678359.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4950eaf37e3b6491da1d/1606371664937/gibbed_borderlands_2_save_editor_weapon_tutorial.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc27eb48ef7301f8b1ae02f/t/5fc3d1be4f9837572054cd93/1606668734806/19069967109.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_off0000ca54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA54 5844 bytes
SHA-256: aad5681821a524fc6ef9ca422477e20658fc9374498f768ac600118837d220e8
font_01_sfnt_off0000de3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 10724 bytes
SHA-256: 6fc0baf48ff468d7d241c69270228296264e743b5d2c51b02397d7cab5ca70dd

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