Malicious PDF — malware analysis report

Static analysis result for SHA-256 7866da2b4ae9842f…

MALICIOUS

PDF

82.8 KB Created: 2021-03-20 18:10:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 486c52faf186e26a5ba804736bec4615 SHA-1: d87d2ef1b8ab062ad3f2b3cfd05198aa8dc87c38 SHA-256: 7866da2b4ae9842fb0f27ca1d8d16d248fde1d6ff537830536ef4c04eca45ab8
186 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous external links, with many hosted on disposable domains, suggesting an attempt to manipulate search engine results or distribute malicious content. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • 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://zajinet.ru/wix?keyword=the+bible+experience+free+download PDF link annotation
    • http://gagogepatajebe.medianewsonline.com/introduction_to_embedded_systems.pdfIn PDF document text
    • https://wabezapodila.weebly.com/uploads/1/3/1/4/131437306/gafupogetivunat_foboto_pimuwuwa.pdfIn PDF document text
    • https://pilinuxuxip.weebly.com/uploads/1/3/2/8/132814996/xowoga.pdfIn PDF document text
    • https://dawoxojukuput.weebly.com/uploads/1/3/4/8/134890950/tabokadojararez-lunariser.pdfIn PDF document text
    • http://fusekimutoxi.sportsontheweb.net/my_little_pony_the_sims_game_download.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/zuxanab.pdfIn PDF document text
    • http://nexekeb.iblogger.org/33670966316.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/hjjdhcn/hello_neighbor_act_2_online_game.pdfIn PDF document text
    • https://cdn.sqhk.co/zefafulolit/ZeghYok/soul_music_70s_love_songs.pdfIn PDF document text
    • https://subegawi.weebly.com/uploads/1/3/5/3/135394411/golavufo_vadixufivawami.pdfIn PDF document text
    • https://cdn.sqhk.co/remudejifi/fbZjdsy/brazilian_soccer_player_ronaldo.pdfIn PDF document text
    • http://moxokivotalunuz.iblogger.org/7667840469.pdfIn PDF document text
    • https://fakegegi.weebly.com/uploads/1/3/5/3/135312823/76252.pdfIn PDF document text
    • http://puxuwowu.iblogger.org/10_generation_family_tree_template.pdfIn PDF document text
    • https://cdn.sqhk.co/bexuxoxabim/DiiF4UP/elenco_do_filme_furia_de_titas_2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_ae00a6beb97f4109930e3be03dd42078.pdf?index=trueIn PDF document text
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_802368d5d9fa4bc4868688e06d602a5c.pdf?index=trueIn PDF document text
    • http://mobukug.myartsonline.com/timuvixateguxobejizabojuw.pdfIn PDF document text
    • http://dubirapotemudi.rf.gd/81994788235.pdfIn PDF document text
    • https://cc0b58a5-7bf4-4b41-9cd7-d9bc0cd2cc6f.filesusr.com/ugd/6dc98b_2562f3551e58413793cb0edf45d448d8.pdf?index=trueIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/velunaromujubo.pdfIn PDF document text
    • http://xofenilar.epizy.com/gilusudosafojokeka.pdfIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_980ca16c3b974b75b5e6f18975676944.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d6f659c-14db-4def-a138-d28a0f45da9f/how_to_use_a_mr._coffee_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f589121a-c7a3-4824-9cf2-e1bc11759605/7335188518.pdfIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_326529436ec64195a6bd4132ea49b13e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/521c9279-a731-4c3c-8766-e1c4c856e902/how_to_take_off_glacier_bay_shower_handle.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 5024 bytes
SHA-256: b4fae75d8eb931a1bed5095b511ac9618d4f0ada37df83921a9c3e9c3894d909
font_01_sfnt_off00010b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B14 10608 bytes
SHA-256: 2bb3e0dd177a2d3bdb21d92b0cd70df625a436093390729edfc2fc57b2613bf8
font_02_sfnt_off00012f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c