Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d976d64edea8477…

MALICIOUS

PDF

154.2 KB Created: 2021-03-02 06:02:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 9341a849f9b06f8ad69ba1bbfbeb9464 SHA-1: e6ef80a502e5af9c7205a532276a5b65a2bec7bf SHA-256: 3d976d64edea84779426f39992f92c8585bee07a6dc0bf85c34ff53e153241c6
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. ClamAV detected it as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt, likely using a spearphishing attachment as the initial access vector.

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://dugedepap.ru/strik?utm_term=what+language+is+god+of+war+theme PDF link annotation
    • https://cdn.sqhk.co/pepupiribojo/ighbO6D/earthquake_emergency_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/busoleva/dibjiPZ/mefeku.pdfIn PDF document text
    • http://videohost.space/zajedoberexbaa8v.pdfIn PDF document text
    • http://mifilud.iblogger.org/following_directions_worksheets_for_3rd_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/44jfZjh/sazome.pdfIn PDF document text
    • http://baby-slings.ru/zibisiwubadeturofigovn4nbh.pdfIn PDF document text
    • http://nubolutlion.xyz/what_are_all_the_enduring_issueshw5wx.pdfIn PDF document text
    • http://jigitozunawada.66ghz.com/invicta_watch_battery_guide.pdfIn PDF document text
    • http://siteznakomstv69.space/76795171992h662l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lapabogi.rf.gd/hexatech_vpn_apk.pdfIn PDF document text
    • http://bamisuk.rf.gd/zokigegobonobanorob.pdfIn PDF document text
    • http://bekawaxag.rf.gd/ssc_analogy_questions.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC73 5428 bytes
SHA-256: 2cfa1d26fff5c47dcb8fe750c12b2d4dd15284f400f88e3045d0f30b5d2edff2
font_01_sfnt_off00020ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20ECB 2528 bytes
SHA-256: fa00ca2efb3740422adce526fcbaa5037a21e39b9482affa9e7d95016e3f9ad0
font_02_sfnt_off000219fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x219FB 12972 bytes
SHA-256: a3e6fee6c3fa506c1eb26e779543c0e77e69a4c982fc900420adbccca602042a
font_03_sfnt_off0002454a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2454A 16320 bytes
SHA-256: 0a71093478b4d45b4d76e64f0f6643daf86e51ddb6e6cf70e5a519f96dfb1fe3

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