Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc762df3660a1531…

MALICIOUS

PDF

84.7 KB Created: 2021-04-06 03:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 47d6b85bbe099445730c84b04d356be5 SHA-1: df4bc1fb7d9312c5a19c846e1d5736d8811bcc60 SHA-256: dc762df3660a153143adf629506e1d2f0f14ce4c2ce4e69f444e92f975d9f97a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution attempt. It contains numerous embedded URLs, with a primary focus on directing users to `https://vilenefex.ru/strik`. The document body is heavily obfuscated and appears to be a lure, possibly related to the topic of 'how to get jvc out of demo mode'. No scripts were extracted, but the presence of external URIs and the overall detection suggest it's designed to redirect users to a malicious site.

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/strik?utm_term=how+to+get+jvc+out+of+demo+mode PDF link annotation
    • http://extrameets.fun/the_hardest_would_you_rather_quiz_everv3iv6.pdfIn PDF document text
    • http://tikovg.xyz/is_there_supposed_to_be_water_in_the_salt_tank_of_a_water_softenerbq7lp.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/33812984454exlop.pdfIn PDF document text
    • http://lonumawewexupo.22web.org/rodip.pdfIn PDF document text
    • http://mastera-saydinga.ru/jemosoxigefektli6w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/884082d1-2665-4c9b-b73f-a8d86b30893b/94053691084.pdfIn PDF document text
    • http://nivobilov.epizy.com/allo_allo_episodes_free.pdfIn PDF document text
    • http://sakigekoxigukil.epizy.com/carrabba_s_catering_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eb7b283-e74f-4c1a-aca8-1c6b50f2c656/zibujuzavulego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e7f67ee-8bc9-4669-9370-6e4019b7e813/gajafinuxitefav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75474602-f20f-46c5-bce1-8c09bde8ad4a/george_foreman_grill_chicken_thigh_cooking_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c3fa95-cffb-4ac6-8e6d-1eedd1a5b482/95092295218.pdfIn PDF document text
    • http://sofugudoz.rf.gd/bs_helper_tool.pdfIn PDF document text
    • http://dufogatate.epizy.com/ginirosunozez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/804aef6d-897b-4597-b8ef-635100b0fe77/attack_on_titan_anime_original_ending.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48a664fa-d075-4e51-b05a-5852ba4fb298/nubawamabakusegobab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4900f4e6-040c-4231-830d-bfd385a77237/lutekumogakolojizifamu.pdfIn PDF document text
    • http://genaligonunik.epizy.com/6362002903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98591079-b9cc-4cdd-97d9-aa40ededb9ca/plantronics_voyager_legend_pairing_windows_10.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_off0001080b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 5016 bytes
SHA-256: b37d62e537d06f152c76ed7c85e96fb1b35d77d79237653de281ac28b6ce4fd2
font_01_sfnt_off00011934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11934 12896 bytes
SHA-256: 8b9d79c43b565836e8de20c09b2a00a808a214324c4060f6acebc8a7f412182c

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