Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c57e3fada14fe3…

MALICIOUS

PDF

75.1 KB Created: 2021-03-04 07:32:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 576cca667eb12b66a635f50152e53605 SHA-1: 8006924b9e9605d55dfd4ad1bd022c4519639994 SHA-256: 61c57e3fada14fe30ace46fc2db2b97bc5221c3998530df32d5aa8f3b43d5bac
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains or use UTM parameters, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to exploit users' trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://fokemale.ru/strik?utm_term=what+occurs+when+tectonic+plates+move+apart PDF link annotation
    • http://artistichomesolutions.com/indefinite_pronouns_worksheets_with_answersmx34j.pdfIn PDF document text
    • https://cdn.sqhk.co/nefikelifu/azZziDe/bopiwesemotubameguzogiwu.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/6605162.pdfIn PDF document text
    • http://hyipinvest.site/97528908052duzjc.pdfIn PDF document text
    • https://cdn.sqhk.co/zufosupiz/jwieijM/drum_pad_machine_app_for_pc.pdfIn PDF document text
    • http://qwertyujg.xyz/lowrance_hook2_4x_gps_quick_guidej321h.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/fibghge/skinstore_cashback_ebates.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzaxepigi/hgl8gim/58302708122.pdfIn PDF document text
    • http://uaportal.site/how_to_reset_a_canon_mg3250_printer00az9.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/ibMGjbg/shoot_the_apple_off_the_head_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/fidisutipamu/ii0cmie/vice_city_game_for_pc_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/nX8jehb/gisedawetezivavuzoz.pdfIn PDF document text
    • https://cdn.sqhk.co/dajuzafum/K3EghCP/rikiz.pdfIn PDF document text
    • http://adv-workshop.site/fenozurowrnjch.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/hCQiPe4/download_game_stickman_dismount_2_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sagoralezerelo.onlinewebshop.net/vuvetotasuko.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 5340 bytes
SHA-256: 4bd57fefa6023b346b393e33f0ca58a099cdbf150dd3192a14d686d856312f1d
font_01_sfnt_off0000fba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 10272 bytes
SHA-256: 460498c509d3954c0aa97f1948ab5652433f18177bd7fc988fd2c156136ddf81

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