Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8dea0dc82bc6dc5…

MALICIOUS

PDF

69.1 KB Created: 2021-09-21 21:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0d26e36be4ae10c14233c13b102a7f14 SHA-1: 769296e56d67a20c6c6cd41e1140aab5fdd4a5f2 SHA-256: b8dea0dc82bc6dc56e81e267310402de7ccf2c1b4e9a7238839c726f2a1cfd5f
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of numerous unknown URLs suggest a link farm designed to redirect users to potentially unwanted or malicious content, likely disguised as software downloads. No scripts were extracted, and the document body was unreadable, but the overall structure and URL patterns point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://horizontire.com/userfiles/file/48099140008.pdf In PDF document text
    • https://fallahi-sch.com/userfiles/file/mapobobufugimezalev.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/7210908257.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/64085483557.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/sodoguwilukoferosijof.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/jesadu.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/54817260754.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/55654441440.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/vufeda.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/defag.pdfIn PDF document text
    • http://pneusmarene.it/images/file/roxesumes.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/dutatadubajidugoguji.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/60681465699.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/diwuzozalitanitemu.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/poworoduxado.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210906182253842.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/4877bf53b889c7fe4e2fe19cb4dfc32c/70068829341.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/dtanaqe1v2is8733nttsvo1ps7/tuvuvipimagexevasigexuji.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/3957271065.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/rikegabuzeruxafifire.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090319024421.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/dabokadazedava.pdfIn PDF document text
    • https://cansandientu.net/Images_upload/files/mifitiradejatebuvan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=windows+7+pro+download+usbPDF 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_off0000b20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20E 10524 bytes
SHA-256: a7267ab40b206ec0fcc41335a595c852e907cb35f5fa0e2dafa4884289637371
font_01_sfnt_off0000c9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E9 14736 bytes
SHA-256: 74f0d8db160ddbe8381d0505b2a30f23ddeb8ff4ed3c3935d58edee048439d36
font_02_sfnt_off0000ef4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1