Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ed028b4338fb1c…

MALICIOUS

PDF

72.1 KB Created: 2020-12-30 04:08:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: bf7aadeb231eadc8b6db25e469e8ea42 SHA-1: 2d6276d4a8dd777c97986764f7073d1e06bcd4c0 SHA-256: 82ed028b4338fb1c2b8514905957eb15503fba7d1996f91e6049b4c111d70587
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm, with the primary malicious URL being trafffe.ru. ClamAV and ML heuristics confirm the malicious nature of the PDF, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to host these links.

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://trafffe.ru/strik?utm_term=modern+warfare+warzone+stats+not+updating PDF link annotation
    • https://lemefiware.weebly.com/uploads/1/3/4/0/134017231/25b727f6ce9633d.pdfIn PDF document text
    • https://tubonizuruzoxuk.weebly.com/uploads/1/3/0/9/130969435/b0c274c7331b.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/hcjax7M/dosewisodu.pdfIn PDF document text
    • https://kalitawolilog.weebly.com/uploads/1/3/4/8/134860066/7351664.pdfIn PDF document text
    • https://cdn.sqhk.co/rasufizo/VFijkWV/microban_sanitizing_spray_citrus_sds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_5fc1ed8d6850e.pdfIn PDF document text
    • https://zepitobazelaki.weebly.com/uploads/1/3/4/6/134619491/tudomuzaril.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5f919cd5c3b4c.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/98567fec-1160-4edb-a9ed-a07d7042888e/26334035279.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a593019-d048-4361-90a1-46e755ef3f19/32801820393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f458a75d-6f83-49a7-a758-513f07757a3e/3107693383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/546c9182-28da-4555-8931-6973c8271e03/afba_life_insurance_premiums.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c14257b-7be2-410b-ade8-02eec11fbc2e/oconus_gs_pay_scale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/491e2aec-0aae-432a-83e5-16dea6247c24/jonojuxexepefowarudupet.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_off0000dabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABD 5324 bytes
SHA-256: ec5f19cf76d5fe4b6e1bbb46a2736444323baef3caa3251ac5571d40b7425157
font_01_sfnt_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 11216 bytes
SHA-256: 407b7741bb282872f74907cf1978c7d131bba66eb26b8c28d68c599c7ce1b15d

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