Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b27acb78e45df0…

MALICIOUS

PDF

67.7 KB Created: 2020-11-27 23:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8cb44e9ea9e745f9a77b7f096d4b2cb2 SHA-1: 816dccda66c4c72ed46709787420995ca1e2ae31 SHA-256: 31b27acb78e45df046cecbaebca181f5fb8e35907e9003f12fce3e1b6637d4f6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier, and contains a large number of external links. One of the primary URLs, 'https://traffset.ru/strik?utm_term=kenshi+armor+smithing+100', is associated with malicious activity. The PDF structure suggests it's designed as a link farm, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=kenshi+armor+smithing+100 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5f8bc78e31a2e.pdfIn PDF document text
    • https://vikowawenoso.weebly.com/uploads/1/3/4/7/134744374/zaferaza_dibezuwuni_wusiwipokolewiw_xomavexoxox.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/5c531598-29d1-43e1-8355-f2de40ab3e71/mrs._harris_dickens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02dc1b77-f834-494e-8915-fa2db2046d1c/remtor_sign_up.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/1512684052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/420882b3-8afc-4b28-931f-46a581b05215/best_race_for_monk_bfa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2751d47d-6c8a-43c2-84d1-9524fad509bd/77120089353.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/11535971333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e756202-85ae-4770-89bc-522252d0aacd/the_definitive_guide_to_dax_second_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/little_sea_turtle_from_finding_nemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a444eacc-9f6e-4773-8fde-955d2dfef787/navutenekagek.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_off0000cc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0D 5232 bytes
SHA-256: f1264619d9975f6e6968f6d734824b68cdf12227c14aae99352c7779e0010957
font_01_sfnt_off0000ddb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB9 10756 bytes
SHA-256: f7b096abd66ca37fc67855f1f9ffa2664fb0b1436998033bd3dc8f0ec3d5d65a

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