Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd3f7182136e10a…

MALICIOUS

PDF

102.2 KB Created: 2021-04-09 13:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f06ad817ba9c147f360e6cdf65c36557 SHA-1: 7e5e465c1a6d5ab123882fb6b4cf249190901905 SHA-256: 3cd3f7182136e10a2f244ef2e2fcf6cfc1a9f7c011982032936d57ac69ac6363
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable domains and exhibiting characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://seumenha.ru/strik?utm_term=non+destructive+examination+technician
    • http://strgb2.ru/51304737643bqest.pdf
    • http://bufo.online/nike_cricket_spikes_bowling_shoesdx1mh.pdf
    • http://ekzo-fruit.ru/amcon_act_2019jgjag.pdf
    • http://lozhobelir.space/8394683256x8dpy.pdf
    • http://geleostone.online/lulipesrxthj.pdf
    • http://katorewudejizut.22web.org/befiduwenetutej.pdf
    • http://xodakarefadivag.iblogger.org/88900580590.pdf
    • http://noncomform.space/pazubetavige95lym.pdf
    • http://thefortykuti.com/15079696004oys1f.pdf
    • https://static.s123-cdn-static.com/uploads/4384316/normal_5fca2e46d7a01.pdf
    • http://doordash.link/hp_officejet_pro_x476dw_mfp_partsr095h.pdf
    • https://cdn-cms.f-static.net/uploads/4455380/normal_5fd09d4f940de.pdf
    • http://onlyforyou.space/how_to_charge_tws_case3xg8t.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lolijexejomak/96244056869.pdf
    • http://zajoneforisomi.rf.gd/ielts_academic_writing_task_2_types_of_essays.pdf
    • http://rejewurisi.rf.gd/astro_a20_headset_sound_cutting_out.pdf
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_7841d3639ff84a57a0703ac9c03a139c.pdf?index=true
    • https://s3.amazonaws.com/fazujo/vafanuf.pdf
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_92a444624c7a41e288d1cd9e7d975dde.pdf?index=true
    • https://36fde204-cda4-4268-899b-58717f9005d0.filesusr.com/ugd/b13063_e185f379966a455ba483ebe40ccc7996.pdf?index=true
    • https://s3.amazonaws.com/xalexojaxipud/free_printable_math_coloring_worksheets_3rd_grade.pdf
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_d374893dd92c4b8ca85917f0253b5929.pdf?index=true
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_b49b0e50da44493ab0dd0506923cd90c.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d7a.bin
5b5ff2a5fad0f0b1f488b46bea9d65dc7e1cca8978c19bac1dc8bedeaad85718		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7A 5244 bytes
font_01_sfnt_off00014f2f.bin
675b85b97639f9ef7e120c6b06f41461ddb08778cfc804f1bf02e069d08a788e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F2F 11340 bytes
font_02_sfnt_off000175d6.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x175D6 16204 bytes

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