Malicious PDF — malware analysis report

Static analysis result for SHA-256 542e5dc38fce5c98…

MALICIOUS

PDF

90.9 KB Created: 2021-03-27 20:17:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc46f355656b0190ec706b7b7dcd7098 SHA-1: a9e58b54b76b3242c567a0818647477577dde95b SHA-256: 542e5dc38fce5c98b9566105bd12a23452b9017f7b2802d26852d8d6793b50b7
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • 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 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://midufefew.ru/wix?keyword=zelda+nes+randomizer
    • http://neyroskakalka.site/kill_team_core_manual_download_freegy59s.pdf
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/werejovuwumobedi.pdf
    • https://tepukijamuboze.weebly.com/uploads/1/3/5/3/135301813/pesonuwoz-wadasa.pdf
    • https://cdn.sqhk.co/xesofosirija/iciiYlm/format_sql_vscode.pdf
    • http://mowefopovog.mywebcommunity.org/bhagavad_gita_as_it_is_english.pdf
    • http://gazozasi.scienceontheweb.net/86530862393.pdf
    • https://cdn.sqhk.co/rufebumu/aghjc89/talking_angela_creepypasta.pdf
    • https://pejupatuwotim.weebly.com/uploads/1/3/2/8/132814375/tewafiseropitof-gidizeluxuv.pdf
    • https://kesadoxiluxar.weebly.com/uploads/1/3/5/9/135974677/kobuwoneli.pdf
    • http://shoop-fe.ru/kugizuwekowevatojexuvilubluhrw.pdf
    • https://cdn.sqhk.co/vefusujix/IxPhhjg/hair_salon_in_walmart_supercenter.pdf
    • http://vvd.bar/the_art_of_seduction_tips501ca.pdf
    • https://cdn.sqhk.co/bepeguvovori/iajjmv2/homemade_multiplate_cake_pop_maker.pdf
    • https://tozabofosizo.weebly.com/uploads/1/3/5/3/135340530/c02f491ae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fazaburifug.myartsonline.com/chapter_13_apush.pdf
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_634fd2b61180408fbddd364a96bec2c5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c27e4722-1671-4ca1-b6ad-e24b70cc1d8c/83790887372.pdf
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_ca62577280484ee7a69082b1c506e5dd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e937960b-bd55-4b07-b9f5-54d9985df8fa/mad_max_two_the_road_warrior_cast.pdf
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_a6470e37b126423199e59c5b80b3902e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/94cfbebc-b510-4be9-b0a4-ac1734031d88/77215876681.pdf
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_6535c8b3e7b94ae7a0dae2ac0ce57471.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4c68f12c-169d-4e49-9879-9ac5b632cc75/how_a_bill_becomes_a_law_flowchart_blank.pdf
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_e10637c7985a45d9a9e3926b445d9fa4.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126f7.bin
c5b7c03c98d80966fde2d03ed32b331cedcd370c20d9aa00c14b3a79026ff9c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x126F7 4976 bytes
font_01_sfnt_off000137cb.bin
ab4ff5ae98dc22644fd99106609099456a00d7fa8bf1de3da71aaca44e58f972
pdf-font-stream PDF embedded font (sfnt) at offset 0x137CB 11316 bytes