Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c7f85c08b28ed6…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 20:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b7e924bef3295960ad3179c7322c90e SHA-1: 6feac70b879e76d4a43db06706f1432c486d2ff7 SHA-256: b1c7f85c08b28ed601fbbf126aceda209f098f6e82e95e7b30e877a04f16577d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious content or phishing sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://drafthe.ru/uplcv?utm_term=pobieranie+muzyki+na+android PDF link annotation
    • http://greatnice.club/updatefiles/file/21094181512.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/52689626785.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/suzexasepalore.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/29283495941.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/maxosikinozez.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/bexukaxiwefabigitepokomus.pdfIn PDF document text
    • http://salkim.com/userfiles/file/16212832650.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/8369161243.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/34490139278.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/32671699442.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/zafezeredaxuji.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/riferoxa.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-10/20210910223829831675.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210916024909_1920521104.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7d1b37d17---57934377691.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/57407874124.pdfIn PDF document text
    • http://harlit.com/upfiles/file/lewalumezonobas.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/zoziresesarajuxosewax.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/rizafolozitotazi.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/25084287574.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/10744046461.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://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_off0000e0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EA 10604 bytes
SHA-256: 04b7b3395b79eee188c5acd1a6aa80b90196592d8f6fba086d4f02e94b47a3ce
font_01_sfnt_off0000f921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF921 18080 bytes
SHA-256: a322af0d3261d49d8a93373f84deff0564f52dd136a3efce7a044b953ea1f0d3
font_02_sfnt_off000125dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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