Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f0e30ba7382f88…

MALICIOUS

PDF

114.8 KB Created: 2021-03-07 00:47:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a123689b050ccc873b79a0794690a0ab SHA-1: cdd2c5e9ed496c5f44e3fe5700002eefbcf503e0 SHA-256: 91f0e30ba7382f88f9fa345301d6e1aa2ce3c266cd8c67433f0dbd55bcbecc2e
244 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, including a known malicious redirector. The heuristic firings indicate it is part of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure to exploit clients.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://crophysi.ru/wix?keyword=baldur%2527s+gate+2+npc+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_600e0adf854c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493545/normal_601de6c057185.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/onyx_boox_max_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500877/normal_603e18e7e59ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390995/normal_5fee839672aba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388160/normal_5fe0de4842222.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/how_to_reset_relion_blood_pressure_machine.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/dichbdg/zombie_apocalypse_2020_countdown.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/art_active_release_technique_reviews.pdfIn PDF document text
    • http://bugilinupapud.mygamesonline.org/rapobufateva.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/ictihha/minimalist_wordpress_themes_for_artists.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/idZgdrJ/37988069287.pdfIn PDF document text
    • http://lemakomude.sportsontheweb.net/46745552247.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/yamaha_timberwolf_250_years_made.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_e0830eb32a1a4c0d963ac0ec40097974.pdf?index=trueIn PDF document text
    • https://b4cee644-3d72-473d-9121-b6d1fce625ac.filesusr.com/ugd/be19e1_a5465d494d544bc08d462eb3fa28f5ff.pdf?index=trueIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_6ef3630f6fa34ccbb6a75de39fdaa8b3.pdf?index=trueIn PDF document text
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_d982e4e459ac4edeb8c3d8f7c7457bb4.pdf?index=trueIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_ae0102e79358497887ffe399b28ba151.pdf?index=trueIn PDF document text
    • http://xiniwipilanaju.atwebpages.com/how_do_you_describe_a_rainbow_trout_grow.pdfIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_f99f8b6a6e984e3b8d4c269868794313.pdf?index=trueIn PDF document text
    • http://bototiluwoge.atwebpages.com/vumekidasisefukizemoto.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_07ee1455339d48009e6e2983176892db.pdf?index=trueIn PDF document text
    • http://duziroro.myartsonline.com/what_if_marvel_episodes_names.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_off0001878a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1878A 5456 bytes
SHA-256: a6561231d649f582652eb84435d459352e6488350521b7e9e68758fa9c81dd72
font_01_sfnt_off00019a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A32 10240 bytes
SHA-256: 0e031c7d0176a340fbecfdfaf3a053a2c0e29789c5855a36242be26b6c6e7969