Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec294c6dc235dc05…

MALICIOUS

PDF

69.9 KB Created: 2020-12-28 12:17:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 732830daf57dface5f081944e14d11e0 SHA-1: 51db0c65528f58cc490e20c7ddfe3e3d60683a1a SHA-256: ec294c6dc235dc054e0f3475e62faf8cc3c2736c9251e1a8173b156669d28343
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for an embedded URI pointing to 'traffset.ru'. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Donkey kong mine cart carnage', suggesting a lure to a malicious site disguised as a game download. No scripts were extracted, but the presence of an external URI is a primary indicator of malicious intent.

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=donkey+kong+mine+cart+carnage PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387702/normal_5fd1c08cabf00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5fa3e3b0c538f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486981/normal_5fb57fad18eb6.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/37ccd8dc-fb39-409a-b6f3-a67e2874b1b1/46563499614.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/accelerometer_calibration_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/what_is_after_a_million.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/suxifojeleleju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35b52053-2965-43a7-9b2f-d25e6233fceb/9205976319.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/62005230541.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/15238676995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70caa4e8-726a-4461-878c-cd12e9891944/slope_cool_math_games_unblocked.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_off0000d45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45D 5072 bytes
SHA-256: d8b277a14ef2573c1559442aa6a0a0c95a6dcb062786bd8d135747ceee014549
font_01_sfnt_off0000e5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A4 10800 bytes
SHA-256: 8a19e456bf00c5ea313cfc0a70f1ccae5545992d59ca2e5de7cbeec07a116bd2