Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a0d61f59bc6ad6…

MALICIOUS

PDF

91.5 KB Created: 2020-12-04 22:32:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b063260aaae70850d6c010a9f246fbe1 SHA-1: ab06241d5088f9ad0a5399b5fd1ebcad3817fddd SHA-256: 74a0d61f59bc6ad6262d4ed1154bf7c17894339eefdb678a160b9c303451030d
156 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many pointing to other PDFs, which is indicative of a link farm or a distribution mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafficel.ru/123?utm_term=bond+markets+analysis+and+strategies+6th+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446650/normal_5fa8e4d243ee6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_5f9fe6d816d66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392439/normal_5fa4598178ae5.pdfIn PDF document text
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/9a68da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7925c0b-1886-4678-8a73-ae758460af1a/zudalemafux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c725bf-04f1-4dfe-a5af-a1a67013df68/diworevogugimusepiwowediw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc950ff9-427c-489e-8237-e8899d76d0e5/baritone_tc_fingering_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/ducks_of_colorado_identification.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/contractor_agreement_template_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71ccdddd-abce-4087-a8c0-958e3e507273/3309181016.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_off00012807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12807 5824 bytes
SHA-256: 3c958801102cba999949bf97c527ffe06f8edf764ea00ca791f7455f7c255801
font_01_sfnt_off00013bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBD 10920 bytes
SHA-256: 1fa36176f95c84a68ff92c3dbc62fd6f6b514701fee2f0d3634e69794085c3fa

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