Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf7d3a2463d1655…

MALICIOUS

PDF

74.8 KB Created: 2021-01-13 18:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5810e4d8bb0236903df98c5dbbb36b6 SHA-1: 7ac723b64c42e891c1b7d065640be25139953638 SHA-256: 2cf7d3a2463d1655d68ecf01ca43906830f60266b68e1db93f0b6c91afb76d04
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a primary one pointing to 'trafffe.ru', suggesting an attempt to redirect the user to a malicious site. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual lure. The presence of multiple disposable hosting links further supports a malicious intent to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=lithium+ion+battery+applications+pdf
    • https://cdn-cms.f-static.net/uploads/4379217/normal_5fe7a0f71c9da.pdf
    • https://site-1174733.mozfiles.com/files/1174733/pofixukap.pdf
    • https://cdn.sqhk.co/jenexovu/ig4gjQY/wild_blood_font.pdf
    • https://site-1206985.mozfiles.com/files/1206985/14627006454.pdf
    • https://static.s123-cdn-static.com/uploads/4420019/normal_5fde2272bc549.pdf
    • https://zipufalazuviw.weebly.com/uploads/1/3/1/8/131856517/4394970.pdf
    • https://fukoxifixe.weebly.com/uploads/1/3/4/4/134460993/guluk.pdf
    • https://site-1178325.mozfiles.com/files/1178325/hard_boiled_eggs_calories_per_egg.pdf
    • https://static.s123-cdn-static.com/uploads/4369631/normal_5fdf7882d8175.pdf
    • https://site-1233552.mozfiles.com/files/1233552/android_share_files_between_phones.pdf
    • https://static.s123-cdn-static.com/uploads/4421342/normal_5fce23d6c9b6f.pdf
    • https://cdn-cms.f-static.net/uploads/4413578/normal_5fd38762774fa.pdf
    • https://site-1172874.mozfiles.com/files/1172874/xiaomi_yi_mini_dash_camera_arac_kameras.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vukusa/wutimabuwo.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_off0000e624.bin
86b61c2bcb37fe65d5ff37984355a5171c63081fd9731f2e2caedb23a5679a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE624 5580 bytes
font_01_sfnt_off0000f8f7.bin
28864f5959cb0bfa340b618d5de37b15f39c1f647f06bdd3054da0346d67f2bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F7 10860 bytes

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