Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3d073694110769…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 21:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e71a7a02269508078c113e893166a197 SHA-1: b0f02166cf886e393622e469d141f089cb669373 SHA-256: fb3d0736941107695f2045227619451cdac3bdb04741e1a1283a1c39f127998a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous disposable domains, and it employs a 'password-protected archive lure' technique. This suggests the PDF is designed to trick users into downloading a password-protected payload, likely to bypass security scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pistant.ru/uplcv?utm_term=how+to+find+voicemail+app+on+android PDF link annotation
    • https://penzion-pod-rozhlednou.cz/img/file/89439787588.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210906_045632.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/mesogax.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210915195339_s1nizd.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/masabasamofuju.pdfIn PDF document text
    • http://ecogestval.es/userfiles/file/68206996756.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/98084715984.pdfIn PDF document text
    • http://xenangheli.vn/public/files/gowibovidugejudomip.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/rodukaniganipenesexitew.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/dewidoselulol.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/40445295868.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/46708431722.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210910200517.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/raxodori.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/lezeje.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/jilolomala.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/40094137486.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/xapeli.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/tijadakofapo.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ivtv4aee0irr0b9gk89j5tk19u/27792702830.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318688c4b49---piwobevamewovikexe.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_off0000dc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC45 18360 bytes
SHA-256: 090aeded149b774a1d31813104ab3459382edde200838d60666e3eb12d442255
font_01_sfnt_off00010b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B97 10756 bytes
SHA-256: c5cfebba254809782d115d7676c60573d61f83e940908fc29c0893d012a5fb68
font_02_sfnt_off0001244b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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