Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a26da3167197c7…

MALICIOUS

PDF

97.7 KB Created: 2021-09-13 15:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2aa2492ce6d35dfc2d39314ad9f3edb3 SHA-1: 54bc9e87e0074d0b51387e5c031b7eecb7f39350 SHA-256: f1a26da3167197c745a3e18d92639e57ca8b5eaa23784ccd5dd3ec0ca6e5b26d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=root+toolkit+apk+motorola+one+vision
    • http://elsekmont.eu/userfiles/file/kasalerojuwidufobutebiw.pdf
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/16096837187.pdf
    • http://2990592.ru/ckfinder/userfiles/files/xekubimipirowaz.pdf
    • https://pasarangroup2.com/contents/files/84107638378.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/hnrnk3vs9vji0vahvqn1en9lq6/zadidorokowus.pdf
    • http://legalinet.eu/userfiles/files/tozixeruxeboruf.pdf
    • http://jumpinfit.it/userfiles/files/wotabawup.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e229a7fb05---tuwezipesekopagekavijodu.pdf
    • http://metrocars.london/survey/userfiles/files/povigiwunepuwa.pdf
    • https://elesud.it/img_pagine/file/79490933142.pdf
    • http://nissanotogovap.net/uploads/images/files/bipopejigiwofef.pdf
    • http://oreade-breche.fr/userfiles/file/20227443404.pdf
    • http://rimini-portal.de/bilderarchiv/file/navonotazemu.pdf
    • https://deltarealestate-eg.com/userfiles/file/riwidevowotapidodeb.pdf
    • https://okazdedziecko.pl/_files/Media/file/mofufosuguzofazadeku.pdf
    • http://www.awakohchang.com/image/upload/File/ifulanunavukuriwobanak.pdf
    • http://imhyuk.com/imhyukeditor/userfile/file/gixivewujozigizi.pdf
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/8361964616.pdf
    • http://h-st.nl/bestanden/files/vuveruvijopuxixalaju.pdf
    • https://atavio.ru/files/file/88123867284.pdf
    • http://status-go.net/gfx/userfiles/files/konarolunalozitefi.pdf
    • http://problemconsulting.com/img/download/files/93889875782.pdf
    • http://wsospice.org/uploads/userfiles/file/file/11088480427.pdf
    • https://heks-tech.com/app/webroot/userfiles/files/dosewatonotejekemovudu.pdf
    • http://krr-nfe.com/suratnfe/UserFiles/File/redotub.pdf
    • https://casasholidays.com/scgtest/team-explore/uploads/files/vowopawagewigo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011391.bin
68cbc6a5941c8b185c4743ea46878fa64d07b53c7f2cd8c088e138de40b47ea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11391 19880 bytes
font_01_sfnt_off00014849.bin
dc71eab70ceb90c63d99015c7b36ccb962a4f626f3843eb4a54963eb17f42c53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14849 10616 bytes
font_02_sfnt_off00016093.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16093 16792 bytes

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