Malicious PDF — malware analysis report

Static analysis result for SHA-256 016ac3bde53c8f29…

MALICIOUS

PDF

71.9 KB Created: 2021-09-18 16:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 88953f781f3624d490acd6e2431d0de4 SHA-1: cd8f89bab8fff89ad81813beb0483138e2a6bce8 SHA-256: 016ac3bde53c8f295c2c5882801d9ac199975a97f9bda2c33cca0f3ea33e4172
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a deliberate attempt to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=one+piece+live+wallpaper+for+pc PDF link annotation
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/vorunurilinakixaxolinedod.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/zadukalizixozuvilivuvod.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/75369411597.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/soxuvu.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/cd1358a7c2e451f55fdedb5e23546657/39369488649.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210903043814.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1631506044.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/41056895924.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/50282515595.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wozedazuwegefe.pdfIn PDF document text
    • http://dalaichau.com/files/nedilukurojedovovusuf.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210904034942.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130cd7a8f766---55386533261.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/sumeropawazuzajokog.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/40567238339.pdfIn PDF document text
    • https://atiksigorta.com/files/kulajojesu.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109031137057773.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/94073132739.pdfIn PDF document text
    • http://newworldss.com/uploads/file/78560304079.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/rivevopokivemokifeba.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/8338934723.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/wumowuvutuli.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/raselekuzufisoxuri.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_off0000b53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53E 16948 bytes
SHA-256: d1a74e75ed8f29b90bff38a3cdd388bf98c2ac76efea00b7e692d54c3a3c726a
font_01_sfnt_off0000e11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF932 10384 bytes
SHA-256: 9bf6dc119bed1f400a9e734097a9e55be3eecdf8bc4d16131f18653cefe7a626

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