Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3cc0f3d02911bd8…

MALICIOUS

PDF

66.9 KB Created: 2020-11-13 16:07:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc16cca42db2650cdaebbd4ce3c30b56 SHA-1: 56ebc53dc812d803c967f64e9c1c639ea2ea7bef SHA-256: a3cc0f3d02911bd8834663039f36a29d7471f7f2dc7980c88e574f0c346ce633
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, trafffe.ru, which is likely intended to host a malicious payload or phishing page. The document body, though heavily obfuscated, contains text related to 'Aluminium sheet 2mm rate', suggesting a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=aluminium+sheet+2mm+rate
    • https://cdn-cms.f-static.net/uploads/4393754/normal_5f9904a6cc5df.pdf
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f87627a152f7.pdf
    • https://cdn-cms.f-static.net/uploads/4372104/normal_5f8d48d9d546f.pdf
    • https://cdn-cms.f-static.net/uploads/4371020/normal_5f8c92384da6b.pdf
    • https://cdn-cms.f-static.net/uploads/4469351/normal_5fa5b50d37101.pdf
    • https://cdn-cms.f-static.net/uploads/4479470/normal_5fa6a9d0f32aa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/aa5e71c6-49a2-4889-a887-9467a3318b87/zatonofozogibojika.pdf
    • https://uploads.strikinglycdn.com/files/5b1e68c9-9920-4d43-8d61-2149e06a424e/twilight_saga_new_moon_watch_online.pdf
    • https://uploads.strikinglycdn.com/files/08afef5b-a223-4831-bb71-3790c7a19f7c/71059494283.pdf
    • https://s3.amazonaws.com/jokotaziweluge/gozananaba.pdf
    • https://uploads.strikinglycdn.com/files/c103822a-b396-4698-b84c-9bc90a743761/70088761778.pdf
    • https://s3.amazonaws.com/digigitusuduk/learn_to_fly_idle_hacked_cool_math.pdf
    • https://s3.amazonaws.com/biwubeleba/god_of_war_family_business.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c87c.bin
21d592aa2113fba78dafcde2da7a4a048748adafd3db06bfa08dceed2911f1b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC87C 5044 bytes
font_01_sfnt_off0000d972.bin
fcd36cf0d322d067735a15ec3635cbacc7663eb6d9aadc6f53f3e9c592b16fd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD972 11156 bytes

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