Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e66c6aeb7639df3…

MALICIOUS

PDF

74.9 KB Created: 2021-09-14 06:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 106a210e7cc44f3a0557badeb989837a SHA-1: d7a66063a5a0149bc740f9aeb3bb4010fb48f209 SHA-256: 5e66c6aeb7639df3b3e4c76c395fde777f30458f90c52b7959d65b8f82d5f36e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. The PDF structure and embedded links suggest an attempt to redirect users to potentially malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://saxonrt.hu/img/userfiles/files/giximefudilekafapex.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/66228068863.pdf
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/27581675330.pdf
    • https://taipeitccia.org/CKEdit/upload/files/gisafubunipidiruda.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/1796196864.pdf
    • http://centreforeffectivecoaching.com/media/file/kudire.pdf
    • https://sibconsulting.com/contents/files/2003828205.pdf
    • http://dsraxys.com/uploads/zipuju.pdf
    • https://listapp.in/ci/userfiles/files/sixemumagomo.pdf
    • http://nasledie-sluck.by/var/upload/file/toloposafazudopinibafam.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614018a33c9be---41124881156.pdf
    • http://www.smpnuenen.nl/images/files/zigesozawuguxomikelaw.pdf
    • https://fotoprint.lv/downloads/file/jinotoretobiwupokaxu.pdf
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/75903471891.pdf
    • https://vcubusinesssolutions.com/userfiles/file/dijata.pdf
    • http://chapraptti.org/userfiles/file/85677766593.pdf
    • http://lesen-und-schenken.de/userfiles/files/44531961545.pdf
    • https://rgcsmt.org/ckfinder/userfiles/files/87119846110.pdf
    • https://detectiveoffice.net/userfiles/file/89576527456.pdf
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/viwaduwi.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fca57d1bde---12286059178.pdf
    • https://areicon.com/images/file/91539038446.pdf
    • http://forepic.com/_UploadFile/Images/file/tubejepiwo.pdf
    • http://drivescuolaguida.it/userfiles/files/dinokavokale.pdf
    • http://islenapuntos.com/campannas/file/83563995689.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bbg+post+pregnancy+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_off0000c226.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC226 16792 bytes
font_01_sfnt_off0000da38.bin
1da5c9d8e92e246298772b27c9c9be0f6c92c0c09e700daafce3b5bdc9df08bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA38 16576 bytes
font_02_sfnt_off000104d4.bin
68110ab508b9d57f177f02c8f18b5e9edd02016815c252fb104a2b37796ed23d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 10964 bytes

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