Malicious PDF — malware analysis report

Static analysis result for SHA-256 8beffba788044af8…

MALICIOUS

PDF

80.1 KB Created: 2021-09-11 05:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0fa0447225ea6e7ca45feb9ddccecd01 SHA-1: 02d065d720b4bea65779c0929473f5db1d1a69eb SHA-256: 8beffba788044af8ed5e308249edb6cbeaa3c4135b33a3f37df7f7205fad3595
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://taksis.lv/taksis/userfiles/file/sazavunuvajokoxafekuxe.pdf In PDF document text
    • http://baby-daycare.com/uploads/files/202109051604209073.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/54966745217.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/9864362723.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bijagazusos.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/rifutagixonewugumozupenop.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/38237936000.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/76039299398.pdfIn PDF document text
    • http://beiks.info/public/file/53344040953.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/xonagunisirixi.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/48237830974.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/29539235500.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210902220438.pdfIn PDF document text
    • http://dd-eng.com/files/files/nabaturemipekon.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/kufujusixuviwew.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/finajanekon.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///jojola.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/7750709567.pdfIn PDF document text
    • http://dsagco.com/Upload/file/maxoku.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132a62957e87---vuroloxisasesuwa.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/momesub.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/0a55301712cfa8a54896b656d42258a3/reximofezalotusakupop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=gta+v+mobile+sitePDF link annotation
    • 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_off0000d6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C2 17412 bytes
SHA-256: 003cc8ba1a5cb9102a0ea9310000d56567b8a34e8d536217d5c2576f5066f85a
font_01_sfnt_off0001039a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 10308 bytes
SHA-256: 7493a53adf066267ae781eda41a033b620048b72cc25e9c2f28cf4c8dc19ba65
font_02_sfnt_off00011aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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