Malicious PDF — malware analysis report

Static analysis result for SHA-256 b058ab409677811a…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 11:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf0b3b95e7c65f05c72f6767c564a0e9 SHA-1: 158fa0c1545c0dbb597e45c307b13516976f42ba SHA-256: b058ab409677811a5eb3d0d170b155c3ee3bdb7b93cafd6349dc202d88d90a78
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are on disposable hosting, indicating a link farm or phishing attempt. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' confirms its malicious nature, likely serving as a downloader or phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=pocket+god+android PDF link annotation
    • http://asu78.ru/userfiles/file/dutupotawolibufiwovorin.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/80679575989.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/losisodutek.pdfIn PDF document text
    • https://akemi.ro/hirek/file/55960305908.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/dogisasunasupozesiradino.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/15883507420.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/rotefadibufe.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/venuzozoguwuz.pdfIn PDF document text
    • http://www.clinicaepilepsia.cl/ckfinder/userfiles/files/doliriwot.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/bufonuzorafinaravoginoken.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/benatagi.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/rixabagumegurofelonok.pdfIn PDF document text
    • https://12shio2.com/contents/files/gifosaturawokozuturilegot.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/43547093169.pdfIn PDF document text
    • http://sergeybazarov.ru/file/4236525158.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/gikadinirekogubero.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/46367458596.pdfIn PDF document text
    • http://sjhtractor.com/d/files/87303834010.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/sawamapusinesefoxol.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/mdibju293q7jm8du6jo8dmu175/ruvusinemeladi.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/xasukavevuwuguku.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/055525168b69ecc32ab524bf6a5839bd/88827772986.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/tunogumujizufaziban.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_off0000e003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE003 10424 bytes
SHA-256: 6015bbabacc2fee75190da7a8a6d332d0eaf33324bbe632cd03934e95a927b63
font_01_sfnt_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 18204 bytes
SHA-256: edf78b256907cc9758154c25f760d1fc07aaab140912b4f6ec99565927abed24