Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a40485e7cd2bec1…

MALICIOUS

PDF

84.8 KB Created: 2021-03-14 19:10:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d5a58855a7a7dbbd81ea79d33c5d7ba7 SHA-1: 6d216700aa89b52110a3b3c33de0ec10afdb5e10 SHA-256: 7a40485e7cd2bec1b07216cb4c70f45df486fef64ae27a7dc880015e31334450
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious intent through a large number of links on potentially untrusted domains. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/strik?utm_term=how+to+make+excel+formulas+permanent PDF link annotation
    • https://cdn.sqhk.co/duponetix/biinggx/guide_for_homescapes_2018_page_20.pdfIn PDF document text
    • https://cdn.sqhk.co/girasufu/dM95hhH/xabitojikejetiwilemubor.pdfIn PDF document text
    • http://kavanepamor.iblogger.org/daguwag.pdfIn PDF document text
    • http://nadipewin.mywebcommunity.org/fakimavojelaweb.pdfIn PDF document text
    • http://zosuzalazuxobob.iblogger.org/entourage_season_1_parents_guide.pdfIn PDF document text
    • http://lupazul.mywebcommunity.org/gezegixujojujepuboni.pdfIn PDF document text
    • http://pabitej.22web.org/79982956275.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/dozefaraxapatexule.pdfIn PDF document text
    • http://dazolovegom.mygamesonline.org/binozu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://numotuvafoja.epizy.com/love_breakup_status_kannada.pdfIn PDF document text
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_e89b7c678b96496ebc8e4aa404001c55.pdf?index=trueIn PDF document text
    • http://mofuvenelopupo.epizy.com/child_development_theorists_match_activity_answers.pdfIn PDF document text
    • http://mupumirupuwanaf.epizy.com/44772386292.pdfIn PDF document text
    • http://letilewe.rf.gd/fegapuvela.pdfIn PDF document text
    • http://gatafowe.epizy.com/royal_mail_envelope_size_template.pdfIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_f245f6f535f747b2800f017d6c6838ed.pdf?index=trueIn PDF document text
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_7e77991b909a4cf98a0cabf833453329.pdf?index=trueIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_169ea4426d8240de90032fc27f48ab60.pdf?index=trueIn PDF document text
    • http://boripodadup.epizy.com/do_wendys_spicy_nuggets_have_dairy.pdfIn PDF document text
    • http://judiwotilo.epizy.com/duraflame_infrared_heater_instructions.pdfIn PDF document text
    • http://kesudakuf.epizy.com/10611287401.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 5344 bytes
SHA-256: b11528c21add4313e97c9476f1607942773fc56bbfd973777ffe587d2af3118a
font_01_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 11324 bytes
SHA-256: 9e5578eba6b531a3df8f21a3396fdda635f658a173c133eb1275a2921bf839c3
font_02_sfnt_off00012fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC6 16232 bytes
SHA-256: b2cbfceaf44fc4a56d1321c5677f125dfbde6a5f8c873b6a17361dd7c2aa5302

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