Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cefc40898f031d3…

MALICIOUS

PDF

80.6 KB Created: 2021-03-11 15:57:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa2c6ad8606377facea9a75ad4faa56b SHA-1: ecfe098a72c9a36db72e7e1420b353a48c473f2f SHA-256: 6cefc40898f031d3921fe9e19ff2198e6766253bb171a18f80a0d9f3abf73716
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, indicating a link farm designed to redirect users to potentially harmful sites. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/123?utm_term=larra+el+casarse+pronto+y+mal+pdf
    • http://usesoda.pro/linajidukunepatanukhpnth.pdf
    • https://cdn.sqhk.co/pubabolab/mKgh2jg/animal_sounds_app_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4423714/normal_5ff44751f0c3d.pdf
    • https://static.s123-cdn-static.com/uploads/4411694/normal_5ff3afca761ac.pdf
    • https://repitosa.weebly.com/uploads/1/3/2/6/132681506/borafesi-vesetebiwagof.pdf
    • https://cdn-cms.f-static.net/uploads/4407303/normal_603673960b283.pdf
    • http://centerverifybadge.com/51662152420482jz.pdf
    • https://static.s123-cdn-static.com/uploads/4498868/normal_5fdfcb4445fdd.pdf
    • https://cdn-cms.f-static.net/uploads/4402261/normal_60413baf77be9.pdf
    • https://kewekekonuv.weebly.com/uploads/1/3/4/7/134732265/66204355e07ad2e.pdf
    • http://homearfes.com/22964382223gklsq.pdf
    • http://micrometerdigital.xyz/live_weather_forecast_houstonei1bu.pdf
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/fakarexetegaj.pdf
    • https://dexovepiniputo.weebly.com/uploads/1/3/4/4/134400909/39b24bece28ab.pdf
    • http://realnoe-obshenie.online/180279833733aady.pdf
    • http://prizinsta365.site/cute_animal_coloring_pages_to_printrpmzv.pdf
    • https://cdn.sqhk.co/fimegasaz/iiWjfjh/hoi4_close_air_support_console_command.pdf
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/db62d2e264c8.pdf
    • http://osummer.space/87018149104h5r0i.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_7a471159c68946b1b58f9fd783254d98.pdf?index=true
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_626d9c48bb534ce8833449c01b387bcd.pdf?index=true
    • 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_off0000fb89.bin
bd33f74e6e5f83f4a5fb0e4cfd802b4b2388bf330f11549a275c8a84fb41b50e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 5344 bytes
font_01_sfnt_off00010db0.bin
203d1b08e025ae95fc4ef77575d079593f89f9a5f9145f69f51182ffc5fd4f30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB0 11696 bytes

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