Malicious PDF — malware analysis report

Static analysis result for SHA-256 693d7658a10d25e8…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 12:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c9c2bcf8b82f17054b061092b370b1a3 SHA-1: 3e29d0a957be8fb716e257bb88636bee889a1f7b SHA-256: 693d7658a10d25e87ce6977ed508f3ca72e640b9c1f8da09d8a97632ccfd228b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to numerous disposable domains, which is a common tactic for phishing or distributing further malware. The presence of many external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://irlanc.ru/uplcv?utm_term=wcc2+game+asset+file+download PDF link annotation
    • https://pass-eco-energies.com/ckfinder/userfiles/files/42129977326.pdfIn PDF document text
    • https://fuoriscena.eu/file/sefetav.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/11747007710.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/sazivixisobirilufiw.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/78816590014.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/57252453283.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613049a34dfbb---76108260392.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109180457202631.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/kawadiluwide.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/buzajenejob.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/50426512534.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/gopujowofifevitomil.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/jufilezifevibemadibin.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/xipuvutanedeniwolofivubo.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/bopavekakas.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/69264289799.pdfIn PDF document text
    • http://www.pilartangguh.com/file/bazesifuxagizoluz.pdfIn PDF document text
    • https://inarsindbari.org/uploads/romekotizimowiko.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/dipowi.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/31950541239.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/gibebevoretixewulaguzu.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/nobisorefonegagemadim.pdfIn PDF document text
    • https://oalysa.cz/ckfinder/userfiles/files/tider.pdfIn PDF document text
    • http://220-wm01.netdbhosting.com/file/7271798803.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/86320002436.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210905034503.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/zikobelelinamin.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_off0000b4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D4 10920 bytes
SHA-256: 55c3612dcd3c3484280e8ec4c037d58832710f2c4e54f31b29aea0e507972f20
font_01_sfnt_off0000ce0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0E 15408 bytes
SHA-256: 46e59347f847b1fe6f14f6877b2f00d4d0008796b94ad44319baa0a703e60def
font_02_sfnt_off0000f533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1