Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2035fbc1f0c5553…

MALICIOUS

PDF

69.4 KB Created: 2021-03-28 17:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f99f7ef50ad14ce8c1a70dcb6158d60a SHA-1: 5be4c651788456bf651bf2a3bf12a042260586f4 SHA-256: e2035fbc1f0c5553d9fcc7965e7f2542286547c3c48ab08facd5e83cbfd8c097
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=book+of+mormon+seminary+student+manual PDF link annotation
    • https://susuwiwonilo.weebly.com/uploads/1/3/1/6/131606006/59707041.pdfIn PDF document text
    • https://patewolenapew.weebly.com/uploads/1/3/4/5/134525441/sobovisisimilo.pdfIn PDF document text
    • https://cdn.sqhk.co/desixurate/0piayBe/australia_post_mail_redirection_cancellation_form.pdfIn PDF document text
    • https://cdn.sqhk.co/tizesefetus/Dh7gfya/41454374246.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/jch9jaV/best_social_media_downloader_for_android.pdfIn PDF document text
    • http://vopugixeroramox.medianewsonline.com/73218237688.pdfIn PDF document text
    • https://ranemexamegen.weebly.com/uploads/1/3/4/4/134440137/juwogilenix-repotupowe-xirawusirid-filawemopoxu.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/does_a_non_cdl_driver_need_a_medical_card.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/igsRnok/bricks_and_balls_game_online.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/98185493463.pdfIn PDF document text
    • https://fudegedetet.weebly.com/uploads/1/3/4/7/134733785/fisewezinezo.pdfIn PDF document text
    • http://kunepuvobimamin.medianewsonline.com/bevozipudumewiduwamovino.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/igfjfKe/68273792162.pdfIn PDF document text
    • http://tizeretozu.22web.org/how_to_start_a_black_and_decker_coffee_maker.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4e9107b-ea7a-46dd-9434-10729a3140ee.filesusr.com/ugd/2e3df4_0addd6f5a323446386a7990cd2e34a30.pdf?index=trueIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_839226fcf30c4c028cc80dda48a58b2a.pdf?index=trueIn PDF document text
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_c38fee30781049f48e02df43c6ab809f.pdf?index=trueIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_4318c3abee554f12a309f10bc72fb5d7.pdf?index=trueIn PDF document text
    • http://rogofijanititad.epizy.com/piwufewijex.pdfIn PDF document text
    • http://valaweno.rf.gd/bosiw.pdfIn PDF document text
    • https://cb0508fd-2a1f-4901-a161-a76823ee8e4f.filesusr.com/ugd/52013e_5ad7c8bf0c7a421795d071e6c62fbdec.pdf?index=trueIn 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_off0000d089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD089 5268 bytes
SHA-256: 5b210d75a58dde7434055d7ea94ded630dd99f0550d29fb3783b07dc8f28e146
font_01_sfnt_off0000e26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 10620 bytes
SHA-256: 3c220842624aa68c6a7b022b3932801b7eb17695328ed53b2c8cb48c2afb2643

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