Malicious PDF — malware analysis report

Static analysis result for SHA-256 643c65f42464d2eb…

MALICIOUS

PDF

87.3 KB Created: 2021-03-23 07:19:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92cf104ae6e18d433eaa385528efeb20 SHA-1: 7f0b5d7c85c886f5f48960ca96aee584bc9b5cde SHA-256: 643c65f42464d2ebcac7fdcd56bee567e0be6e2b9aaff3748861df9c1f1e8fb7
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination by using many distinct hosts and UTM parameters. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://vilenefex.ru/strik?utm_term=population+geography+definition+ap+human+geography
    • https://xafusotegemuwif.weebly.com/uploads/1/3/5/3/135304795/6718e530845f7d.pdf
    • https://cdn.sqhk.co/wibononuve/il3gfic/rebel_inc_escalation_skidrow.pdf
    • http://nonretloli.site/gojodovagurisditqd.pdf
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/41944.pdf
    • http://fesebenawasoz.iblogger.org/41906861732.pdf
    • http://jumbochecker.com/videohive_wedding_invitations_packc5inu.pdf
    • http://gomunawuwox.22web.org/volatility_cheat_sheet_github.pdf
    • http://xumukekuvag.22web.org/lipogetuf.pdf
    • http://dajewerudo.22web.org/programmable_logic_controller_tutorialspoint.pdf
    • https://cdn.sqhk.co/wevujawej/heSVhjp/benarazuzedifogegeseso.pdf
    • http://stroiline74.ru/snow_slopes_australiaa0gkl.pdf
    • https://beluxavin.weebly.com/uploads/1/3/4/5/134507718/mituzorolamunuxu.pdf
    • https://cdn.sqhk.co/kivipemo/CsqibHb/duzibadufefubonatamarukez.pdf
    • http://it50off.pro/zizudigajgmp.pdf
    • http://bimojulumefa.iblogger.org/peugeot_103_spx_fiche_technique.pdf
    • http://xinupavob.iblogger.org/uk_gaap_accounting_standards.pdf
    • https://satisetuxa.weebly.com/uploads/1/3/0/8/130813646/bd160ba2c.pdf
    • http://sodahq.pro/rakozugamometawubawoposewbxqi6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nipufafinera.epizy.com/back_2_sender_by_team_salut.pdf
    • http://viruvivena.epizy.com/buter.pdf
    • http://fatixoromagik.epizy.com/convert_from_to_word_document_online.pdf
    • http://norisufa.epizy.com/tutorialspoint_advanced_excel_functions.pdf
    • http://jisipisadelotab.epizy.com/hp_deskjet_2620_all-in-one_wireless_inkjet_printer_reviews.pdf
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010019.bin
9e51009f51db61031431be4ba5b4e5df32ce2e99e5600393fe6f7efa9c4ddca6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10019 6408 bytes
font_01_sfnt_off00010fe4.bin
6add4f6bea234135957abab681a98385c80aa75f2ca74e5e0d4e3fd6afda97f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE4 5380 bytes
font_02_sfnt_off0001220a.bin
7314a8110a688275e79cb4cd5cd058a9f858becaa7f01fde0a687197ddc85302		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1220A 1716 bytes
font_03_sfnt_off00012a95.bin
1e41b5806f30d06d30bc9e0b28f9d85fa7a1d7dff815dea866bcd894a15e639c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A95 10424 bytes

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