Malicious PDF — malware analysis report

Static analysis result for SHA-256 814caab5d857ff76…

MALICIOUS

PDF

71.6 KB Created: 2020-11-18 09:07:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2ecab9e598e10d46d4cf4c57664faa7f SHA-1: 885c4b4ef99958aaf3a7e0ca84ea9d2b627d9338 SHA-256: 814caab5d857ff76dce15386d978ea98c89b82ac4245ca3ee58cac37fa6909e7
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to a suspicious domain, traffset.ru, which is likely used for phishing or to host a malicious payload. The document body, though heavily obfuscated, suggests a lure related to 'Chevy solid axle swap parts list'. No scripts were extracted, but the PDF structure itself facilitated the inclusion of the malicious URI.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=chevy+solid+axle+swap+parts+list PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419828/normal_5f98ad21ec295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392647/normal_5f98cf1c3b150.pdfIn PDF document text
    • https://pasukanat.weebly.com/uploads/1/3/4/4/134474220/zifizejifisurawuvex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403407/normal_5fa59e09ed2c8.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/kijimumugax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d006e57e-e9b9-47a0-bb90-4a80c960d61c/redshift_cinema_4d_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f6fecb6-6ce5-4aed-b7e6-7a55bc7aa015/arquitectura_minimalista.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84397b60-da21-4e6e-993c-c87d34bbee81/dragon_city_android_hack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b55ed98-2d91-48b5-8212-6f7c9674e52f/kevalik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18533498-8e1c-4493-93cc-1b7b69946e11/time_attendance_management_v_2008_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2db76ecb-5581-4b44-aa0f-cb6cd1513318/vinodepazero.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/comparative_and_superlative_adjectives_lesson_plan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB80 5076 bytes
SHA-256: 27fd674662d42372aaa251c1d17522c1e98fd64f75da79862404cd3e115f30d8
font_01_sfnt_off0000dcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFB 11196 bytes
SHA-256: f62af45502af6fec74d769d0d053caf32cdd50525390a05c2370746704bfd624
font_02_sfnt_off000102e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E8 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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