Malicious PDF — malware analysis report

Static analysis result for SHA-256 17bbe427c9609323…

MALICIOUS

PDF

79.1 KB Created: 2021-09-10 09:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09c1ce9b12103206eb1ee4777bda6022 SHA-1: c643b531fcfc135f9eca2bf6d116c34d6e3a21e7 SHA-256: 17bbe427c9609323dc37bd4a372826528612a9b0341ee268a8f2021201247529
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://wolfpackbasketballacademy.com/content_docs/fopumigotiporuzegedomek.pdf In PDF document text
    • http://riskhedgetech.com/uploaded/file/48312388861309dc74ab5e.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161379dadc00c6---polifutefujomamurimemo.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/takumuxubazuxexotirus.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/80290702264.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/kesawadogepewavu.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///purazolanejeme.pdfIn PDF document text
    • https://33mobility.net/uploads/files/9829898619.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/mazomobuninosebokow.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/56847635245.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/35574778264.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630619860.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/74983727659.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/87540836648.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/78454268905.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/84600776447.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/xoximovu.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210903_9F9BF35DF8C83AD4.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/55021800445.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/wikuwanuvek.pdfIn PDF document text
    • http://attlas.center/userfiles/file/dapufitonukuzibomur.pdfIn PDF document text
    • http://kdekdyjak.cz/data/49885013547.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/99d4aa30728cc44ef868ccc484a07888/bimutikezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=vmos+type+appPDF 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_off0000d4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 10152 bytes
SHA-256: 81095817ba337479d44de584e6ec031931344ae44d195a0d2b26fafdfc2d6d85
font_01_sfnt_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 16920 bytes
SHA-256: 38b44ec9b0286eeedbe6aa12debd0d1c44e19aab0d0cc4b51b5993da79914619
font_02_sfnt_off00011721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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