Malicious PDF — malware analysis report

Static analysis result for SHA-256 842ef4152fb7182b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 05:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64fd5af6d84fd3952eff406cc8b1d6f5 SHA-1: 266dcabfd3c60f818314729c00e54e1cb52d9b73 SHA-256: 842ef4152fb7182b852e74d3fa6e378dfc28b8c913a8bc2866086422f76a40d8
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating a likely attempt to manipulate search engine results or redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying it as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://katachizu.com/img/news/files/90458784282.pdf
    • http://kutyasturak.hu/images/files/vojemokapep.pdf
    • http://ainut.fi/userfiles/file/41939047612.pdf
    • http://watdoenwevandaag.nl/upload/boruvasukiguwak.pdf
    • http://eatoceanic.iorderfoods.com/uploads/files/tejimul.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16139e3abe58d7---nawona.pdf
    • https://wfbulgaria.com/uploads/wysiwyg/files/lijemumirogowawozabok.pdf
    • http://hong-tour.com/FileData/ckfinder/files/20210909_EBC9EB2C88E13CE3.pdf
    • http://kfbma.org/files/fck/file/61047752203.pdf
    • http://nmways.com/uploads/fckupload/file/50985860950.pdf
    • http://phuongsen.com/img-chamthi/files/35566973259.pdf
    • https://khabul.mn/mmpa/userfiles/files/zodadiw.pdf
    • http://auto-rad.pl/userfiles/file/50099637094.pdf
    • http://wujipacking.tw/upload/files/12811261620.pdf
    • https://www.delaneyllc.com/ckfinder/userfiles/files/86429458810.pdf
    • http://tidomusica.com/uploads/files/202109042256413940.pdf
    • https://granitnet.hu/editor_up/pusuwutikudirixoredutaj.pdf
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/xoposevizelozowewudoraje.pdf
    • http://carrasvilla.es/uploads/files/kotubujedibita.pdf
    • https://yogaspotny.com/userfiles/file/88237522966.pdf
    • http://vibestedu.com/_UploadFile/Images/file/pesatazenugexum.pdf
    • http://chayka-svg.ru/files/11141999951.pdf
    • http://hainescentreasia.com/images/file/bawikiwajigaf.pdf
    • http://huseyindurmuslar.com/images_upload/files/dubifefijerudenodaleban.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gta+sa+lite+file
    • 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_off0000d8f8.bin
6c91cc3fd22238acf9adf97650d56cc23d0242e0277a27583a8aba773a255d29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F8 9924 bytes
font_01_sfnt_off0000eefe.bin
bffcd9a579510725720516da1b764d4d98d30cf9f00642c207cfe31c838e8635		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFE 17768 bytes
font_02_sfnt_off00011ddf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDF 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.