Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb2eb400af44a3f4…

MALICIOUS

PDF

188.1 KB Created: 2021-10-06 11:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4dad9dcbea2b187b4e6f291317cf8b29 SHA-1: dc78615ee1f40a979e6f82561209c8c549619883 SHA-256: eb2eb400af44a3f4ceee60d590828ab18dbb7b9b839f3099a1c4e3f68cfa6748
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and a link farm heuristic points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://unseretochter.ch/images/file/4661957421.pdf In PDF document text
    • http://arqing.es/ckfinder/userfiles/files/sufegopebubewow.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/lovaxinisug.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/70046886042.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210917_2F97D16A03E3E0B4.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/23575198228.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/pojewasoju.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/bofitupilotawed.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mutewarokebafow.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/suwidinokopofora.pdfIn PDF document text
    • https://avflash.nl/upload/files/tejepozirasuzovikarikaxis.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109140030293850.pdfIn PDF document text
    • http://bociany.sk/media/file/bowejadoturifugivogal.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/vidifigosoxefalowu.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/bexaweweninesuleriwijizo.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210930194538_g8e1vp.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/siladevulakogojakuvaxema.pdfIn PDF document text
    • http://espicycooking.com/files/file///viwunigajizaxexemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=classroom+of+elite+2nd+year+vol+3PDF 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_off0002790d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2790D 11016 bytes
SHA-256: 39cc4af1ca813a519c0afc3b8f0841427fd6d20e639818cb48a1d0c724dc2616
font_01_sfnt_off000292c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x292C9 22020 bytes
SHA-256: f80961e6e49dc89fdfc5d006753e184d487d798df3a83aa3009500bf7154b3ad
font_02_sfnt_off0002ca9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CA9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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