Malicious PDF — malware analysis report

Static analysis result for SHA-256 5968545fa5939c46…

MALICIOUS

PDF

91.9 KB Created: 2021-09-18 11:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07d570fa8bf0da1197b60e2feb24ff82 SHA-1: 0e3b0adf514a389221ebd34e9783b5e86eba9c99 SHA-256: 5968545fa5939c46843a29a11bd5aeaf23ebe02a77a9e9bc63dac568402ca5cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous disposable domains, with one URL being https://catamma.ru/uplcv?utm_term=define+quinary+industry. The presence of embedded URLs and the nature of the link farm suggest an attempt to phish credentials or deliver a secondary payload. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 5

  • 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.
  • 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://catamma.ru/uplcv?utm_term=define+quinary+industry PDF link annotation
    • http://paneldeconso.com/userfiles/file/xivavetirofopimubuj.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210909_085206.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/puvewetimimudigabutiravu.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/nakepiwokepixuvusu.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/84017843761.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/33295936437.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/50410462732.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/19976998870.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/16268762276.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/doxerofowinijejo.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/30443498561.pdfIn PDF document text
    • http://eva.am/files/ccd17478dfe64d29.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136708cadc9b---kezubusezukulajofuviride.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/76052108036.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f77c1b5a0b---fidixigoxosisakubazi.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/wazegewiwowupariduzubo.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/regiw.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/86665703760.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/54706144636.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/suled.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/delexijojowuzonegomuxama.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_02_sfnt_off00010c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2F 10540 bytes
SHA-256: 19fbed578bdd99ac1c2ab56e4a3fe9a69c06f82846c7ea9ac7d61a7275e12e91
font_03_sfnt_off0001242a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242A 23592 bytes
SHA-256: ef6eb3df654d24a192cb19adddf7f9d5dc18937b108c5ae6248523a62b8288ea

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