Malicious PDF — malware analysis report

Static analysis result for SHA-256 570a5c497fcfa6c5…

MALICIOUS

PDF

80.5 KB Created: 2021-03-28 13:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 35721e641c4dad300c4fe3c3ea9f8bab SHA-1: e79840ffa1a550228bbb2f7f9f9b67bc3023592a SHA-256: 570a5c497fcfa6c53dbdb9d5151e30ad1f6d6c075aa096d507bc487449f8d31d
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable domains and are likely part of a link farm for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or trojan distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=harry+potter+and+the+philosopher%2527s+stone+book+review+in+afrikaans In PDF document text
    • https://cdn.sqhk.co/rilixuzewiv/gdk9gfp/vatican_guided_tour_length.pdfIn PDF document text
    • https://cdn.sqhk.co/nupegefozub/gdjamp8/temple_run_2_game_download_karna_hai_pagalworld.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/unjgzJv/skyrim_fortify_alchemy_potion_recipe.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/veegft7/when_will_cruise_ships_sail_in_europe.pdfIn PDF document text
    • http://vaxenovutejuzid.sportsontheweb.net/ayyappa_songs_book_in_telugu.pdfIn PDF document text
    • http://nunesop.scienceontheweb.net/zudexaloveli.pdfIn PDF document text
    • http://jolovomolosubi.getenjoyment.net/psychodynamic_psychotherapy_cabaniss.pdfIn PDF document text
    • https://gugajapu.weebly.com/uploads/1/3/5/3/135330564/betidefixupodef.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/hcicjgn/42701251294.pdfIn PDF document text
    • http://gixapedotamerow.mywebcommunity.org/18697382129.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/Hghhjjh/app_music_mp3_download_free_copyleft.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/Pgjibjd/samsung_calculator_apk_6._0._1.pdfIn PDF document text
    • https://ruwizugaxuluba.weebly.com/uploads/1/3/4/7/134759804/9422863.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/gG1haje/xufekijurijowusesitila.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3215690-35ba-4bce-915f-db1a6f912a1b.filesusr.com/ugd/d32599_b48c2a3987954f5e849ecb200c0bec7f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fa49d5f-acfb-41f9-837e-3ddbe8477fdb/32035064156.pdfIn PDF document text
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_b94b8fdbc2e049eab25a98c8fb3a90ac.pdf?index=trueIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_03e27e8c521841c1b08704affe5caca2.pdf?index=trueIn PDF document text
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_9d2f474bf6124033bceb22f618c21ae5.pdf?index=trueIn PDF document text
    • http://bolirazebaf.myartsonline.com/string_theory_david_foster_wallace_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d19530da-0c29-4905-9f7a-689004f6c52d/17_day_diet_cycle_1_recipes_pinterest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb452de-c968-46f3-ad7f-e5e5a1da5b11/vitibek.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_off0000fc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC09 5584 bytes
SHA-256: 6e6d3a252fcfe69f9a165ebcc187183bfbbd5f65dc90f9d71fff54a1631a719a
font_01_sfnt_off00010f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 10856 bytes
SHA-256: f9d05c60caadfae84b5d5f1417ed37d7eaae09ef27c9367f8ac2962bef7b2f3c