Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0dfcde8f58dcff4…

MALICIOUS

PDF

79.3 KB Created: 2021-04-26 16:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 95f7074bfb0406c242f60f6566b9b3b3 SHA-1: 72e0d9d2b0acad01cf1fda19cd87e26195b10ff6 SHA-256: a0dfcde8f58dcff47ee8b996144a91079621d3cc98b5b806a263f4817b0b08c3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://vilenefex.ru/strik?utm_term=database+administration+fundamentals+training+for+mta+exam+98-364 PDF link annotation
    • https://cdn.sqhk.co/lakuziwi/0ibsqjc/89125197997.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/iicdiek/disordered_proliferative_endometrium_with_stromal_breakdown.pdfIn PDF document text
    • http://naligixe.getenjoyment.net/bibliografia_de_vancouver.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498330/normal_60593ad61b34c.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/gkgghaZ/women_s_t20_world_cup_2018_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/falugojafat/hed9khb/57296955217.pdfIn PDF document text
    • https://cdn.sqhk.co/jisokemefaz/iidpuid/mega_millions_payout_calculator_michigan.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/jdfhjE0/turbo_water_slide_car_racing_aqua_adventures.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/iaCgc23/bloodsport_gif_drums_jump_around.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485714/normal_5fd8b560c46c7.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/1ada4845-4775-4d27-9fde-677465648b15/what_are_the_most_alkaline_fruits.pdfIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_3e3b8f8021a44db980cfb0eb2d44ac6b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c137e64-3b0e-4bd0-b9d9-d2f176d41cf3/data_science_undergraduate_programs_uk.pdfIn PDF document text
    • https://7211abc3-b26e-437e-abd8-8a8c7ebd4af5.filesusr.com/ugd/0683fb_f684f6a12df44ae09d0ff1da47cfbe6b.pdf?index=trueIn PDF document text
    • https://0feddc0e-03bc-46a3-a741-45303deff239.filesusr.com/ugd/6ea6a2_239cd1c524d94d7d9365d57fdc286023.pdf?index=trueIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/project_report_on_work_life_balance_of_employees.pdfIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_199574659aec4d5f9c29ff89322d50ed.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_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 6224 bytes
SHA-256: cc6200fe6a3a22dd67a127c54b8a21b9fbb33abc3f9aee367c050b2f3ba0cbe5
font_01_sfnt_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 10820 bytes
SHA-256: c8593f26157a69911b5c3653defa51d2a8eceeb708c0b8a4bd89400302682797

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