Malicious PDF — malware analysis report

Static analysis result for SHA-256 8811a19b7b8759bd…

MALICIOUS

PDF

93.3 KB Created: 2021-04-08 02:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db540924955628ad65daa9d27e5d7430 SHA-1: 61e34ab16a6f3931d6e6ae7095078191dd85c2cc SHA-256: 8811a19b7b8759bdba908ab4904da1b7e214943c557ccdf157c07e031231a116
186 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, with a critical heuristic detecting a link farm. The document contains numerous external URIs, including a primary one pointing to 'seumenha.ru' and a link farm hosted on disposable domains like 'bexowobiminefi.mywebcommunity.org'. This suggests the PDF is designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-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.
  • 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://seumenha.ru/wix?keyword=los+tres+padres+de+la+patria+biografia
    • http://bexowobiminefi.mywebcommunity.org/15664491642.pdf
    • http://sreda.city/cuisinart_electric_pressure_cooker_cpc-600_manual2bdjk.pdf
    • http://mekomob.getenjoyment.net/athlean_x_90_day_meal_plan.pdf
    • http://xifadezuzurap.medianewsonline.com/zedijonupido.pdf
    • http://finansi-7.online/best_free_joomla_quickstart_templatesx0n2w.pdf
    • https://cdn.sqhk.co/jubawiwa/Ml6iigf/bosagedorojikafetitunax.pdf
    • https://cdn.sqhk.co/rotuzuwibi/BsOhshd/subexewatuzutowepelisazeb.pdf
    • https://cdn.sqhk.co/jasowipe/gckghgi/37892309234.pdf
    • http://tofotibuwul.sportsontheweb.net/dewalerakuweponenu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xebuvuwov/pokemon_games_for_nds_emulator.pdf
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_90bb2e4183cb474ca9ff8d36cc6a0b76.pdf?index=true
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_424768a33c7a48d0b67c528297eaf492.pdf?index=true
    • https://d12d056d-c16f-42d2-bb36-b12dbd13f8e5.filesusr.com/ugd/a2005d_a48e3f0a211f4641b7df30a87744ff72.pdf?index=true
    • https://s3.amazonaws.com/likerajatob/bupanogepeled.pdf
    • https://s3.amazonaws.com/savukojubusum/python_programming_language_tutorial.pdf
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_17ee5a5997354f9ca2100ca410e346b8.pdf?index=true
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_ee277ed5a547456493ea520cf70256cb.pdf?index=true
    • http://sisufovofow.atwebpages.com/cae_exam_vocabulary.pdf
    • https://s3.amazonaws.com/rodigapigeta/39517194796.pdf
    • https://7a69a04d-b0b3-478e-a927-895b34d3dd44.filesusr.com/ugd/159848_6e95d6bdbfa042cabae5096097f252f6.pdf?index=true
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_41d32657311a45419aa91b279f50fdbc.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_off00012e8c.bin
1daadd6309b0f29b9c757232cee6efd764e0b9bf3eb3da1268d12de610265843		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8C 5288 bytes
font_01_sfnt_off00014096.bin
a14005a4c725577504a948e052e7644f02c9d9b7fc0dae39082a3f2fad342cd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14096 11636 bytes

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