Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c34cc574c28fb7…

MALICIOUS

PDF

72.6 KB Created: 2020-12-14 18:45:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 99b0dc90adb173a71d62000a057f0b87 SHA-1: 4cf44c0b04a65a358637eb63451d080ade7c98ee SHA-256: f2c34cc574c28fb7feb3edcdb66b42e3bd9c8a0ac38f84345c17dad95440f422
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary malicious URL identified is 'https://traffine.ru/123?utm_term=applied+social+research+definition', which is likely used to host phishing content or further malware. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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://traffine.ru/123?utm_term=applied+social+research+definition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416301/normal_5f9b2d50b1f6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421058/normal_5fa2a403d9304.pdfIn PDF document text
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/a6eac3ec.pdfIn PDF document text
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/eab17.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/gimuvurina.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/36139a00-c37f-4b53-91eb-3ae995a62ce8/44942508960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a574636-52de-49d5-9bb4-40fa6b04284d/asm_exam_fm_study_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c356a13a450babf351fc/t/5fc16c073c6ccf69f393b0de/1606511624688/school_district_of_waukesha_wisconsin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6d8336c-f4f9-46b1-a4d0-0eecb70c3dc9/rizupuxizobof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdfb72ef-536e-4630-aae3-6491cf406dc2/all_things_algebra_gina_wilson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/788bb83c-a45e-4dc8-a4ad-a099d54f2af9/nilujijibokijuboziwilib.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_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 5232 bytes
SHA-256: cca472c38c6780b716f191ed5d56a52603ca5c9e129652f5c4c3e422292bf93c
font_01_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 10656 bytes
SHA-256: fc622b044455df9873ea496546752e8d09ffb6cb8c5ce80079e63b14f91e80f1

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