Malicious PDF — malware analysis report

Static analysis result for SHA-256 3736ea1e8f355a32…

MALICIOUS

PDF

79.0 KB Created: 2021-03-04 06:40:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 613816f45232f2717004127d51512f28 SHA-1: 65fcaa89eda28eb3c6523e53d99fac2d23b91850 SHA-256: 3736ea1e8f355a3299d1a95675674720afd448b52627b37b14573116c4607301
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure and an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jottigo.ru/strik?utm_term=what+is+the+best+payday+loan+for+bad+credit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5ff59ae48256d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482638/normal_5fd92fb5a175b.pdfIn PDF document text
    • https://cdn.sqhk.co/tubadaluzafu/90pjdaU/identity_v_hunters_names.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/25431309708.pdfIn PDF document text
    • https://barefofu.weebly.com/uploads/1/3/4/4/134492989/7297323.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/ry7Eih6/wisuvesitesoripoguzoxedu.pdfIn PDF document text
    • https://sanepawoja.weebly.com/uploads/1/3/4/5/134579143/xazot.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/Z3npn47/nexinebuki.pdfIn PDF document text
    • http://xevidome.iblogger.org/36863424801.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/haU3hck/auto_transmission_repair_tucson.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408593/normal_60019c2028d3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456116/normal_5fffcdd49e2f1.pdfIn PDF document text
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/9125207.pdfIn PDF document text
    • https://dufibivi.weebly.com/uploads/1/3/5/3/135346242/241490.pdfIn PDF document text
    • http://tosasex.22web.org/lofasuxav.pdfIn PDF document text
    • https://xifepifedezuz.weebly.com/uploads/1/3/4/4/134495844/fuzimodetu.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/53803750279.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/aferry_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/15954553666.pdfIn PDF document text
    • http://kisalonokexiwi.atwebpages.com/jopub.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/zatanuwalinuwane.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/anlet_roots_blower_maintenance_manual.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 5496 bytes
SHA-256: 43f53ea0bf2f6570a506085f36a0f063900491eeb35da05932914c5d83a8fa9a
font_01_sfnt_off00010b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B71 10148 bytes
SHA-256: d084ad961347288011c09dbd310d23bfb986d6976a2fd8d8c9fae9bf2d58436d