Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d6b3e3edbc40b6…

MALICIOUS

PDF

65.7 KB Created: 2021-02-16 11:16:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 9d92b28f467e50dea6bf9f154c05a53e SHA-1: 62c183628999b2fd2bcc47881a2a1a622153d9e6 SHA-256: d3d6b3e3edbc40b6bc922516514298cd86f7bf23b3f6d47fcb272727280c4124
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1190 Exploit Public-Facing Application

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple external URIs, including one on a disposable host with UTM parameters, suggests a phishing or link-farming attempt. The heuristic 'SE_CALLBACK_LURE' further supports a phishing pretext, likely aiming to trick users into calling a fraudulent number or visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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=club+cart+charger PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4401559/normal_6001e1e1db5d7.pdfIn PDF document text
    • http://thailandlove.site/why_is_my_kodak_printer_printing_blank_pagesswq1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407747/normal_5ff7c080bec87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_601e6450d45de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375699/normal_5fde899abfc6f.pdfIn PDF document text
    • http://kinoxca.xyz/20576134267fohq.pdfIn PDF document text
    • http://meblik.su/performance_appraisal_research_paperhmmqk.pdfIn PDF document text
    • http://egrn-order.online/74770850441pj0eb.pdfIn PDF document text
    • http://tarizuxewibob.22web.org/circle_template_definition.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/zasepo/borderlands_3_xbox_one_x_performance_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/punctuation_practice_worksheets_4th_grade.pdfIn PDF document text
    • http://liboditi.rf.gd/80529124383.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_off0000c3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A4 4928 bytes
SHA-256: 77657cdb364958d3c755017e8e049d93004ecb016395bf43d1a516d7bf02bfa6
font_01_sfnt_off0000d462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD462 10712 bytes
SHA-256: 8b11adb03f91fd3d5ca20eadeafac2d452bcc04dcf50c410a3ba5dd25e407acc

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