Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fc372fb5eeca27…

MALICIOUS

PDF

74.5 KB Created: 2021-01-22 13:00:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 47ba8f850ab141e54849614cd635a3c9 SHA-1: bf133384c7b711a55bacc1a1a8f612d51d8fecf8 SHA-256: a3fc372fb5eeca271b704c4471489e497ee1a468d765e7c0f5a732faa79b0583
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=excel+terminology+worksheet In PDF document text
    • https://site-1172650.mozfiles.com/files/1172650/nadegegoxijuxapono.pdfIn PDF document text
    • https://site-1179185.mozfiles.com/files/1179185/568334466.pdfIn PDF document text
    • https://silajawa.weebly.com/uploads/1/3/4/3/134339193/a359d91c0dd.pdfIn PDF document text
    • https://site-1168537.mozfiles.com/files/1168537/beechcraft_duchess_service_manual.pdfIn PDF document text
    • https://site-1168007.mozfiles.com/files/1168007/jugutenomamunufewov.pdfIn PDF document text
    • https://site-1240303.mozfiles.com/files/1240303/vaguwokaxogogafalumupekam.pdfIn PDF document text
    • https://site-1172173.mozfiles.com/files/1172173/worksheets_for_teaching_reading.pdfIn PDF document text
    • https://site-1203147.mozfiles.com/files/1203147/furniture_mod_1__16_forge.pdfIn PDF document text
    • https://site-1175190.mozfiles.com/files/1175190/40228291751.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369183/normal_5fc674f012d9d.pdfIn PDF document text
    • https://site-1178449.mozfiles.com/files/1178449/spiderman_and_venom_games.pdfIn PDF document text
    • https://site-1173664.mozfiles.com/files/1173664/76436133116.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419637/normal_5fdb7a853c279.pdfIn PDF document text
    • https://site-1174796.mozfiles.com/files/1174796/dadiloguwevazojomipi.pdfIn PDF document text
    • https://site-1174689.mozfiles.com/files/1174689/reading_plus_answers_level_e_nba_superstars.pdfIn PDF document text
    • https://site-1176450.mozfiles.com/files/1176450/woridiragajit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445338/normal_5fdd29ec533a4.pdfIn PDF document text
    • https://site-1168029.mozfiles.com/files/1168029/todenamipedevakabijoto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 5284 bytes
SHA-256: e239d1cfc8887c08beb117a4178edb524ba16097d05d283dbebb627a70e27dca
font_01_sfnt_off0000f675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 11316 bytes
SHA-256: d9a193b3178028505acf3526868e01cbd05d846a42491597c56882d86b66c85c

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