Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea32495253660fd5…

MALICIOUS

PDF

90.6 KB Created: 2021-04-28 00:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a4edfad330b33508424dde910afcd3c SHA-1: 77d84bdb9d2bc889829dbfac4eb909984abb67ad SHA-256: ea32495253660fd513bad5b6e5d735fc89c716db87391bbf833d90c5a3fe5773
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains keywords related to search queries, reinforcing the lure tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=hampton+bay+ceiling+fan+replacement+glass+globes
    • http://rukofuvifoti.22web.org/macrogenics_email_address_format.pdf
    • http://vumogegotawugub.mypressonline.com/zekikasipedisefalekalarur.pdf
    • http://natgood.space/marooned_meaning_in_kannadasq2js.pdf
    • http://fitit.space/94974646103kux3i.pdf
    • http://jovexof.22web.org/franchising_slideshare.pdf
    • http://euroshopmn.space/184195525389347o.pdf
    • http://wozuwekifebar.iblogger.org/pexoresunepovegimif.pdf
    • https://lugulake.weebly.com/uploads/1/3/4/7/134763312/banoru.pdf
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/bipikekodejo.pdf
    • http://agent-spv.space/242923217946xoxw.pdf
    • http://tublitalia.space/telesamagiduzobv14j.pdf
    • http://ziwusis.getenjoyment.net/losifobugubokarukewugigo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mepulufe.epizy.com/dogewas.pdf
    • http://zepedijuva.epizy.com/43679377897.pdf
    • http://nivewurunowu.rf.gd/railroad_tycoon_1_manual.pdf
    • https://s3.amazonaws.com/makumapikeze/best_price_auto_body_shop_near_me.pdf
    • https://s3.amazonaws.com/gotenukevepunin/dabadojidefow.pdf
    • http://sonedef.epizy.com/jizizofojenokofesekipotuv.pdf
    • http://bibuxitagarilum.rf.gd/razokana.pdf
    • http://jowawaba.atwebpages.com/nice_guidelines_hypertension_in_pregnancy_2020.pdf
    • http://penanaras.myartsonline.com/mogixamafokuvejiniropizar.pdf
    • https://s3.amazonaws.com/zowejunef/45732716881.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109d4.bin
d3fcf0da02d5ca44b9bc556be8cef9710a472a69c7bf7d338905e9b70115fcac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D4 5536 bytes
font_01_sfnt_off00011c9f.bin
ee5a1a86767fddfb32605315526d16ea16bf2c9ed267130199022c9dee843f79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9F 12228 bytes
font_02_sfnt_off000145f9.bin
9b6b90087ad242a037c4abcda3a7e1e6f720f468737e54aa4fd5e99d079103e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145F9 16292 bytes

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