Malicious PDF — malware analysis report

Static analysis result for SHA-256 4186baac481a2cc4…

MALICIOUS

PDF

81.9 KB Created: 2021-03-06 13:15:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 01be8549385d9468c6b53e17ecc9e2d3 SHA-1: 3d783e06eab0ae36732ef775287cba76ba88b46e SHA-256: 4186baac481a2cc4988a65d2882ae8d6a9ca309f4bcbd69d16fa67813597c36f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one to 'midufefew.ru', suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to deliver malicious content or redirect users to phishing sites.

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://midufefew.ru/award?keyword=delta+flight+attendant+jobs+atlanta+ga PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375509/normal_5ffa3a412dbeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463809/normal_601625092fa65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387037/normal_5ffd5926b9f58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480173/normal_5fef131d3e6d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488807/normal_601f2b7752f12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450044/normal_602d397b9f5c3.pdfIn PDF document text
    • https://jopikivapanip.weebly.com/uploads/1/3/4/8/134854077/fad1e1197d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454289/normal_6015f232672c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504870/normal_60150f966ef20.pdfIn PDF document text
    • https://rosowimibezot.weebly.com/uploads/1/3/5/3/135392622/ced7f0b17f.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/dadupawo/28499900900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf72d02-751d-4321-8ab6-02693e21c3fc/kivezizofamojudes.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/firestick_remote_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b2cfc31-5fcb-448b-98db-fa257f185e6b/72204983180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d7d870e-943a-4c73-94de-e9dc45f1a2db/what_is_veronica_roths_writing_style.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/fowobudupokoneko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1115a20b-21df-46dd-aa06-24f0c119447d/what_is_a_synonym_for_clear-headed.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/hp_laserjet_p4015x_printer_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf5390f-9174-4f4a-9406-5418a78388c8/gikarixifex.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_off00010459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10459 5288 bytes
SHA-256: 71172cae1b0a3107a23421f199e08bdc8045ead390ee78052cb8f6e5e7b74b4d
font_01_sfnt_off0001165f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165F 10476 bytes
SHA-256: 555cbed94871a55670560bc013cd1bf2652989b1c9eff0cb604d3492b18b4700

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