Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b9fff4c55f13ad…

MALICIOUS

PDF

69.2 KB Created: 2020-11-29 11:35:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f6ac8847f18778c305e91a771b5d200 SHA-1: 7a01c8e464e15bab41af78385669cb2f0dd3b9ba SHA-256: c9b9fff4c55f13ad30ff5137f89d966b547a6b78b8cd1b62bf89b6219c3d7e5c
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to 'trafftec.ru', which is likely part of a phishing lure for a fake 'assistant apk premium'. The PDF also functions as a link farm, directing users to multiple external sites, some of which are hosted on disposable domains.

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 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://trafftec.ru/123?utm_term=assistant+apk+premium
    • https://ropojagininu.weebly.com/uploads/1/3/4/6/134635708/tudosamanumapufum.pdf
    • https://linusakeziri.weebly.com/uploads/1/3/4/7/134747074/6b6b4dc3d85cf7.pdf
    • https://kafigibedup.weebly.com/uploads/1/3/4/4/134479504/pomozaxoda.pdf
    • https://zafojepomekosax.weebly.com/uploads/1/3/4/3/134352399/a9c3810d199a9.pdf
    • https://fofapabijutoza.weebly.com/uploads/1/3/4/7/134713913/19ccd50fa.pdf
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/butujekinol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/satedafadusizo/balaxijojiwe.pdf
    • https://uploads.strikinglycdn.com/files/1cc2ab58-d972-40fa-8a3f-89ada45fc2c4/mivoxenofoxo.pdf
    • https://uploads.strikinglycdn.com/files/4b96a935-a170-42f9-a2d6-4b107a319812/transmission_fluid_for_2005_ford_f150.pdf
    • https://s3.amazonaws.com/tuxexi/73539752470.pdf
    • https://uploads.strikinglycdn.com/files/06d7af3c-0b72-40af-8679-e47915d523cf/bistable_multivibrator_using_op_amp.pdf
    • https://s3.amazonaws.com/mozirolinitaje/mixture_and_alligation_tricks_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/40f6ca2e-0b77-4568-a086-3fc90a788830/zoll_x_user_manual.pdf
    • https://s3.amazonaws.com/fotojipifuzitul/orlando_magic_tickets_seating_chart.pdf
    • https://s3.amazonaws.com/tesapibebujep/kirby_hammer_lord.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5e1.bin
cb9072f881c1fe0ad8900bbcc5a20a23fabb306412f64e001cac76c2a9509f2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E1 2952 bytes
font_01_sfnt_off0000d070.bin
0d6023efd6bd7c9e7a41590e71f39f47165966e58d96d34115a267d03f0bd7d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD070 4988 bytes
font_02_sfnt_off0000e154.bin
09cd23c5bd19c04b8725193a09ee5439d1c2cf6560fbb3b4bc542ff16a7c67ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE154 11620 bytes

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