Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3746a680244b24…

MALICIOUS

PDF

78.6 KB Created: 2021-05-07 20:40:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 280bc42934c9f7dbee9f0dbdd69eceb8 SHA-1: 48f1a7095a375687ff1e94a03da7121a9cd41c0c SHA-256: 2a3746a680244b24a7421f315b1589939e537dd3786b395031d46133104632f8
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://fokemale.ru/strik?utm_term=elna+supermatic+price
    • http://topdiscount.pro/mugimejekebibemafukavyrdkb.pdf
    • http://steh-sistem.ru/loha_movie_full_hd6iqtb.pdf
    • http://ketoxitigojaluk.sportsontheweb.net/55574710322.pdf
    • https://cdn.sqhk.co/litawoxelida/gigfUfg/pps_label_template_14_per_page.pdf
    • https://cdn.sqhk.co/zufuxirap/hi0FGhj/ruvosemof.pdf
    • http://naykaryadom.fun/lajipitaduvinoniwupamuvahnyog.pdf
    • http://luwogexejel.getenjoyment.net/lutoweb.pdf
    • http://vevaxogejaz.scienceontheweb.net/is_the_2010_mustang_gt_a_good_car.pdf
    • http://goodnatural.space/88468387072xyz66.pdf
    • https://cdn.sqhk.co/votojuxosaf/Thdmifh/24990296667.pdf
    • https://cdn.sqhk.co/tamoravuwera/jibigiE/83680801363.pdf
    • http://chestlune.online/kingston_clippers_soccer_tournamentg6q70.pdf
    • https://cdn.sqhk.co/zonakagud/jdgfhbJ/bofudagibisigexenoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ec75ba9f-29a7-4b73-bb51-4c951d20089f.filesusr.com/ugd/17cde0_54609eecef934ab4b8c33cf51f6397e9.pdf?index=true
    • http://roxubimolileko.epizy.com/the_pact_book_jodi_picoult_summary.pdf
    • http://gofudawaropuz.epizy.com/zopupegaxedolifelowegude.pdf
    • http://gawexerexi.rf.gd/wadesexokuvopujikaxu.pdf
    • https://9329dc78-1a6b-4cc7-98ac-1b36262b7dd5.filesusr.com/ugd/d2be55_1b473a2e20fe4fb3866a73bd33d4ab01.pdf?index=true
    • http://ligirewela.epizy.com/bomukasobitujapobabi.pdf
    • http://lorenivi.rf.gd/sogixuvonikifefunol.pdf
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_c127ecfd0bbb49b385a9c78d580bb608.pdf?index=true
    • https://562a32fb-e9c8-4d8f-ac7e-a760da58c396.filesusr.com/ugd/68ec97_9a9b54212200451f8aec77b8ffbdab6b.pdf?index=true
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_0d04c4ad91474d749a278d16d080187a.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_off0000f652.bin
231c5c5508ec56c6f343c381b0210e11c35b9158d5e02b06d05152fdcebf0850		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 5036 bytes
font_01_sfnt_off00010760.bin
f01b74935e3c54c74fe5b892cd986c034c09d9b67adca55a7677fe7b7f7ce5ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 11132 bytes

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