Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3027ceab3285cdb…

MALICIOUS

PDF

83.8 KB Created: 2021-04-03 21:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4f19ce2a430f4123bc88f4ac703556d SHA-1: 80bbf28cb40a307c57ee960236424f9f9ff1d1d7 SHA-256: e3027ceab3285cdbd7c4cd4419590df32343bace1db2877100838f58ca4e03f4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to sales listings, suggesting a lure to entice clicks on the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/strik?utm_term=used+harman+accentra+pellet+stoves+for+sale
    • http://agencymedia-ig.com/bugokonezuruwasodajubbeu4.pdf
    • https://bodukomemewasug.weebly.com/uploads/1/3/4/7/134701633/dogepixaje.pdf
    • http://cardio-active.site/702968711466n4si.pdf
    • http://soldatskaya6.ru/the_neverending_story_iii_vhszmwa9.pdf
    • http://shoppingyxplus.xyz/have_got_questions_and_short_answersc859b.pdf
    • http://love-your-lips.online/tamilrockers_new_tamil_movies_isaimini7g8rw.pdf
    • http://storedubai.shop/would_you_rather_questions_for_couples_cutevq8c9.pdf
    • https://cdn.sqhk.co/jogekiluse/hDkEihq/36673569837.pdf
    • http://ewwe.space/lededanvkd8.pdf
    • http://twitter-center.com/artemisia_absinthium_medicinal_uses9maoe.pdf
    • http://powerhdniy.space/how_did_art_change_during_the_renaissance_periodyhqvc.pdf
    • http://bridgecommerce.com/tepolol8zm.pdf
    • https://fagutefoxod.weebly.com/uploads/1/3/4/2/134235025/9015180.pdf
    • http://nasty666.space/zudoxuxipuludisi6uav4.pdf
    • https://kepiloxuxamife.weebly.com/uploads/1/3/0/7/130740378/beluwotig.pdf
    • http://circulshtangcalip.website/50243595120004v8.pdf
    • https://fofalada.weebly.com/uploads/1/3/5/9/135968840/9675284.pdf
    • http://women-ita.space/fosevalosubimabqq8ap.pdf
    • http://adminhalil.com/8129833328242vxu.pdf
    • http://helplnstagramcontact6088757.com/how_to_connect_hp_envy_printer_to_wifiu5gjc.pdf
    • http://akmurzina.com/1994_polaris_sportsman_400_tire_sizeo5ob5.pdf
    • https://cdn.sqhk.co/budajawisore/uUWCjiS/farowidosu.pdf
    • http://womans30planet.com/rifalefuwijealbgx.pdf
    • https://zomafada.weebly.com/uploads/1/3/4/7/134772300/199779.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00010a22.bin
20b73bf59bfc43a1b7a51516fd61aee57475fa3ad3b7123fb65e528179a8665b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A22 5444 bytes
font_01_sfnt_off00011c8c.bin
7e28a49a6f0ee301c0b673a2d3eaac38a7a112db666a33e2c76aa87e37de6805		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8C 10948 bytes

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