Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e609f1ff8dccde0…

MALICIOUS

PDF

65.7 KB Created: 2020-11-14 11:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6352d0e3c8b3baa448896158c52060aa SHA-1: 15bc482d8b3e9aeb8bc60467c045fef2e84c3ad7 SHA-256: 8e609f1ff8dccde0dcd263b24997e26adcd63c2a31b7904b7545c44dedaa9e72
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM' which indicates a mass of external PDF links. One of the primary URLs extracted, 'https://traffset.ru/strik?utm_term=management+information+systems+raine', along with another linked PDF, suggests a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=management+information+systems+raine PDF link annotation
    • https://dugitesabisaxo.weebly.com/uploads/1/3/4/3/134392589/pubijuguxototi-jebasojiber-gobifibiridemod-munases.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_5f8e44730bb51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389820/normal_5f8f5c2985110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419630/normal_5fa3044f2e8ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5f9389c3716af.pdfIn PDF document text
    • https://jufozovujibozom.weebly.com/uploads/1/3/4/3/134360308/tuzemukiwid_jifofituxugube.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/73e48b64-5b60-4aca-a894-c63a4b4e82aa/jocko_willink_extreme_ownership.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/187fd694-a599-4f29-87d0-ab3723a725fc/big_head_unblocked_soccer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/800b92e6-cbd0-4503-977c-73e409a83c13/marvel_guardians_of_the_galaxy_123_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0773082-b635-4350-a828-8e106969a6b5/11012021133.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_off0000c922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC922 5160 bytes
SHA-256: 512c997da29896247fb67db5309e6c9ffb70014ed5975f766421b146cc693329
font_01_sfnt_off0000dab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 9112 bytes
SHA-256: b2422525521737dad65e6f1895e0fa6366b327ae7ac066e7c3a77b2fe5bb58fc

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