Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c80cf6b853b251…

MALICIOUS

PDF

73.8 KB Created: 2021-03-09 06:50:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d1991329df3bc78427fd834d3a3fbebb SHA-1: 75b76e132066039dd86ed82fc5843d46ad6b2666 SHA-256: d8c80cf6b853b251725ee172d0855334bed40f0c36b51c47ca076d5c1bc0b2fd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm hosted on disposable domains, with one URL specifically crafted to appear as a service manual download. This suggests a phishing or social engineering attack aimed at tricking users into downloading further malware.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/strik?utm_term=2005+yamaha+yz250+service+manual+pdf PDF link annotation
    • http://therarbooks.com/jetuxagovujufudodg3dh2.pdfIn PDF document text
    • http://komarovskii.xyz/how_to_put_together_ingenuity_automatic_bouncerddgad.pdfIn PDF document text
    • http://xalebiru.iblogger.org/36302392239.pdfIn PDF document text
    • http://mirumumavetifun.mypressonline.com/16262795909.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/5gdiigi/hashtags_for_likes_review_trustpilot.pdfIn PDF document text
    • http://xilutemomeliro.iblogger.org/bsimm_9.pdfIn PDF document text
    • http://xepuxesadara.mypressonline.com/adhd_test_for_adults.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/cha9Zje/free_cable_tv_apps_for_iphone.pdfIn PDF document text
    • http://tofoxewesaxizuz.mywebcommunity.org/89737967176.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/d66787c8-5132-473c-8b40-ec6f456d61c2/conflict_resolution_techniques_ppt.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_3cd27ef2a0b24f7ca730c5a32b7a49d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/15ce9b51-f537-4dbd-8ea4-801307d2a8e1/nancy_drew_2019_season_1_episode_10.pdfIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_862dd894848d4384b5e27764aaa69e31.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13aa5e08-1585-4055-90b5-a2ac6ec5d721/ea_sports_ufc_2_mobile.pdfIn PDF document text
    • http://xakagigoneliv.myartsonline.com/when_was_last_new_moon_2020.pdfIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_bdf7c59424e945c3926eb56219395808.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cda63bd-f047-4f41-9ec6-900c637173d8/what_modem_to_buy_for_centurylink.pdfIn PDF document text
    • http://pasifowon.atwebpages.com/the_witcher_3_ps4_manual.pdfIn PDF document text
    • http://diturasenupope.epizy.com/mawafoteporuki.pdfIn PDF document text
    • http://vipodozuwuwo.epizy.com/quadratic_formula_practice_worksheet.pdfIn PDF document text
    • http://gukasitaxe.epizy.com/alfa_romeo_giulietta_2016_brochure.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_off0000e442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE442 5908 bytes
SHA-256: 6ddad2b71958c932173c9a1da226cc1c611bb1d59f7633754017488861442210
font_01_sfnt_off0000f851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF851 9816 bytes
SHA-256: 17a3510eb80a79a2803842cb9f778ea8a804448a41c5badd6806e92b9f1ccc9e