Malicious PDF — malware analysis report

Static analysis result for SHA-256 401d58850fc32159…

MALICIOUS

PDF

86.7 KB Created: 2021-09-08 18:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 21c04fa039d1137c14ff241a16241fee SHA-1: 17c020aa058d7b14b3d126fc21978498debc86f4 SHA-256: 401d58850fc321590eda352b5387f704e453b9f8b8244e22b1406500a1b5b219
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to external sites, suggesting a redirection or download mechanism. The PDF structure and embedded content, though heavily obfuscated, are consistent with attempts to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ski-valloire.com/ckfinder/userfiles/files/nimotuko.pdf In PDF document text
    • https://rawoctane.com/uploads/file/jarutoxafubaguxe.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/24209162878.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/80491999583.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/99081703807.pdfIn PDF document text
    • http://inphilong.com/upload/files/59362306810.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/63595343301.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/95220584076.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/42076632362.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/31309050349.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/94643040503.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/62609322524.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/pumipup.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/15128772282.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/59210451197.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/32235881546.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-2/20210902051359170397.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/nadajanitaxa.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/kuwas.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/vosawokobamusepiwe.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/50795694857.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/zepapumatofokudulofu.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/sujad.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/notimus.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312aff4f876---70124955781.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e5afae699fbd550f4a9b6876b770ca07/56818674390.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/9395300530.pdfIn PDF document text
    • http://dfanchem.com/upload/files/21741026239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=floor+plan+symbols+pdfPDF 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_off0000e7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EF 20116 bytes
SHA-256: 9f431569d29c87441b6884b289a96ce4f146070a5bb0593b6f7744a37a8f3986
font_01_sfnt_off00011d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001358e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358E 10568 bytes
SHA-256: 9c94cc14a47ae5799a2ddc65866b25c6174adca3a3f18cf443c3c091c3df0c71