Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9da12f3e17ca8c…

MALICIOUS

PDF

63.3 KB Created: 2020-11-19 16:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f3e80424f4f6943875997002d21e6d83 SHA-1: 5029b53f5f3dc7863c19f97f8d4ed593ec0d84b4 SHA-256: 6b9da12f3e17ca8c4559f4f9693b46149987142556273fb3abd8b6cff13469c2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farm attacks to boost SEO or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=mukilteo+ferry+schedule+today PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419433/normal_5f9b0e81ab1ba.pdfIn PDF document text
    • https://vovaderinikuxu.weebly.com/uploads/1/3/4/5/134528816/jabesuzodur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376088/normal_5f93e4cf265c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473618/normal_5fabef8419ed3.pdfIn PDF document text
    • https://tanifovekula.weebly.com/uploads/1/3/1/3/131379991/9911025.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://uploads.strikinglycdn.com/files/760bd216-4a3f-47d9-b2be-10620f7474db/warframe_akmagnus_prime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e5dbd40-6def-4c81-9262-b667fe9c2cb6/sidonedepubelonebawapuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec873846-9178-439f-8b6a-691641037fed/nomowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e22252d-b1f4-4538-b76c-1cc1c9d0d080/rubizekugiloduv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b20acf26-c085-477f-a8b4-58de324a5d94/mubegap.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/clear_plastic_lunch_bags_for_work.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_off0000ae8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8A 5056 bytes
SHA-256: a7f34e99f81e10e479588cfacde859c605742388096fe771497d9053d77fb6a2
font_01_sfnt_off0000bfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE4 10088 bytes
SHA-256: 1e2adfbeafb1b3f8f807e00bd2542c1d154553b37bfd4ab71b31b058254a5d65
font_02_sfnt_off0000e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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