Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e1f5df481dcbd0…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 11:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd0f66cab6b5cea37d58061829e4b536 SHA-1: 7dd97ce0286e31ae1d1a72255d6edb47386b2fb2 SHA-256: d0e1f5df481dcbd052cca5a64ab9b147b51e03a9f6abee8f474ea280e64ee5d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to disposable domains, and one heuristic specifically identified it as a link farm. The presence of embedded URLs suggests an attempt to redirect the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/11058b99b081b59b3dae35ec2abd263a/27136950949.pdf
    • https://7mark3t2-7aya.com/contents/files/kizolisobenufonudegemiz.pdf
    • http://acm-medicali.it/userfiles/files/xapopore.pdf
    • http://inteko-tula.ru/f/file/numer.pdf
    • http://eyupsifalibitkiler.com/resimler/files/pulamekeduzok.pdf
    • http://www.europesolidaire.eu/userfiles/files/13815478144.pdf
    • http://archissimo.eu/userfiles/files/80459063473.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/nikujopag.pdf
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/69663790121.pdf
    • http://finpacecuador.com/userfiles/file/5952390270.pdf
    • http://www.siposferenc.hu/html/xuber.pdf
    • http://share-world.tw/userfiles/file/87259073457.pdf
    • http://asu78.ru/userfiles/file/51232483719.pdf
    • http://volareinmongolfiera.it/userfiles/files/gopatumazawafapikapo.pdf
    • http://vivatbacchus.hu/files/file/13352179029.pdf
    • http://petra-dario.info/upload/datoteke/wobew.pdf
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/redenuri.pdf
    • http://sonnenheizung.ch/fckeditor/editor/images/file/53669580661.pdf
    • http://manavpublicschool.org/manav/userfiles/file/11832937148.pdf
    • https://jordan.si/dokumenti/file/jodobafuzovaxadudoxeb.pdf
    • https://coebmsf.com/userfiles/file/bumimufewarizoku.pdf
    • https://smg.bid/ckfinder_userfiles/files/45319844983.pdf
    • http://www.perchegouet.com/ckfinder/userfiles/files/38141106948.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/27d84bc496cdedc04831b34b04740621/risomove.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=free+movies+online+app+for+android
    • 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_off0000b1f8.bin
42617edd5f701e0e2658431f9c0b5fe2d85c30260ebbb1d3551b7787f9a844a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F8 10604 bytes
font_01_sfnt_off0000ca2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2B 16792 bytes
font_02_sfnt_off0000e23d.bin
0cd394d028bbaab865b238c9fd0f1409598302b766e64a97d9bdcf293b77aae0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 15360 bytes

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