Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07a49664917dc6c…

MALICIOUS

PDF

85.2 KB Created: 2021-09-10 02:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f40e4421d132b59cf1f54cf4c440daea SHA-1: dcba7268a3fd8357182799020293066f0cec0a6f SHA-256: d07a49664917dc6c5e52e720c427b4a6a2252c5cf4107c6c5a54c2058a4a01e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous external URIs and is described as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The PDF structure itself does not contain executable scripts, but the presence of many external links suggests it's part of a larger attack chain, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pistant.ru/uplcv?utm_term=android+os+eeepc PDF link annotation
    • https://uclerbaklava.com/resources/file/xevoso.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/14879967424.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/37078954956.pdfIn PDF document text
    • http://hanauhrova.cz/files/49777211017.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/pedopenofubalibezi.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/pasebikevulo.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/jiwow.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/78452195088.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/kifadivo.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/20939599581.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/44324596448.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/teditavuxa.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/34779319792.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/gavovavi.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/95479161307.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/83553808230.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/sutunekaporevadin.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/sogenotegasogotase.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/vebesidukit.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/sumapixaxovidufevajonekup.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/dibaxigokelujulemor.pdfIn PDF document text
    • http://thevale.us/userimages/xofuda.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 22164 bytes
SHA-256: 736f7bd33dda695774c0f0f94c2e03870882cddb1931f6eb8aa9389b09b6f804
font_01_sfnt_off00011739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F50 10184 bytes
SHA-256: 329b92cc9b08770feb2f534b852a7c6444c43795c79ca41d228d49c21e70200f

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