Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7fb46311f8f0066…

MALICIOUS

PDF

79.5 KB Created: 2021-09-17 08:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cfd4b085aee6f21021c63fe0cf9c5c29 SHA-1: 4b60d8473c24c8a8ebb59df5b51a336b33540b35 SHA-256: f7fb46311f8f00666919d0bbf6d62b8f2e0f5c38046d856f920e48682e3a0a4e
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The 'SE_MFA_LURE' heuristic indicates the document is designed to trick users into providing sensitive information, likely for credential harvesting or to abuse multi-factor authentication. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the download and execution of a second-stage payload via one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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 http://gnatowski.pl/attachments/file/nogenutovesebomot.pdf In PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/40094137486.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/wobuguni.pdfIn PDF document text
    • http://offerparts.com/upload/files/16773344691.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/15961006568.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/nipogomegal.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/koxemajovanujege.pdfIn PDF document text
    • http://104408017.linker.tw/files/mapulipefujugetet.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/xupugorapawogi.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/226ed1a1a964c3c304173143733bccae/pixapubiwug.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/savagowaravunuro.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210907102150.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/47222775816.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/gewosotajolumirunu.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-12-20-48-56-11.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/kenofajuzewuvo.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/madusatiwafatejejiwilo.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/37933362196.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/moxawanajipisufexuridu.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/fasuwigokedul.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9becbc147---bajafuwujitaxupofesu.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/95048054986.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/29779386950.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/garobibobefovuged.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=online+message+send+without+numberPDF 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_off0000d0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E6 17824 bytes
SHA-256: 679617bd10f7f4328c6b091cffca60919ebf916a898327e4a2d555504aaaca9c
font_01_sfnt_off0000ff26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF26 11044 bytes
SHA-256: 382e244dc6255309facd2c1e26b34c2af0779ec85b8187b284cf63b3013e1e3d
font_02_sfnt_off00011883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11883 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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