Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ff5601effc77bb…

MALICIOUS

PDF

82.5 KB Created: 2021-04-05 16:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38c238f8a992ff0746feafabb2e98f44 SHA-1: 10fa3b2e38bf9b034ff03a2b679b04abc597f3d4 SHA-256: c4ff5601effc77bbb7477cb3b354c5b8a8483a58b9f3834966c41584c1093197
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful 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://vilenefex.ru/123?utm_term=azores+travel+guide+book
    • https://cdn.sqhk.co/jedugifaxido/gPShd6k/numaniwu.pdf
    • https://cdn-cms.f-static.net/uploads/4370273/normal_5fd82947d0666.pdf
    • http://moxupasasitote.mywebcommunity.org/band_workout_routines.pdf
    • http://pro-gram.pro/pride_and_prejudice_movie_netflix_canada8xiri.pdf
    • https://static.s123-cdn-static.com/uploads/4426073/normal_5fe5f0293d342.pdf
    • http://my-favshopc.online/graphic_novels_for_8-9_year_oldsy09y7.pdf
    • http://dokaxirugik.medianewsonline.com/zolifesenunivojixemabadew.pdf
    • http://tixshopclub.fun/foxconn_n15235_motherboard_lan_drivers_for_windows_xp5edxs.pdf
    • http://rotirir.mypressonline.com/ahead_of_the_curve_book.pdf
    • https://cdn-cms.f-static.net/uploads/4465255/normal_60342f9081ec3.pdf
    • https://cdn.sqhk.co/jojevirelo/pjjeiad/my_airtel_tv_recharge.pdf
    • https://cdn-cms.f-static.net/uploads/4425501/normal_600f4d1339892.pdf
    • https://cdn-cms.f-static.net/uploads/4381104/normal_603a4e28e11d2.pdf
    • https://cdn.sqhk.co/riroxale/ddjiohb/bell_buzzer_for_sale.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dojafeduzig.myartsonline.com/mevovozu.pdf
    • http://sogoxutagejuno.atwebpages.com/43498355342.pdf
    • http://tajiroxajesolut.atwebpages.com/gerhard_kittel_theological_dictionary_of_the_new_testament.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_off000103e0.bin
10c9a6820d53752016d70f1924168b3bf4e625c5fe24a580e093b466c6081177		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 5296 bytes
font_01_sfnt_off00011602.bin
ccbf61d9909fd8dcde6c662116d3d9eb41b1b2ea99d4ddc6fa042aff4cfb16c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11602 11732 bytes

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