Malicious PDF — malware analysis report

Static analysis result for SHA-256 230b538b36b37e3b…

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 11:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7eeb419c7742922d2f999739272c8b61 SHA-1: b3b9e2006f706ff44b55600f25d884cc0df9580f SHA-256: 230b538b36b37e3bfa6f3b883fbebbf9b901f886cf7a16d3305e6858b869440a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. Numerous unknown URLs were extracted, suggesting a phishing or malware distribution attempt. The document body was heavily obfuscated and unreadable, providing no direct content clues.

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://bikaji.zohukum.com/ckfinder/userfiles/files/zisakapuwanuda.pdf
    • https://istanajp2.com/contents/files/vanezagonexagorudibezu.pdf
    • http://fresh-j.info/images/uploadedimages/file/38877877383.pdf
    • http://szerecsen.hu/editor_up/xufadagugopasuru.pdf
    • https://zegaoyun.com/calisma2/files/uploads/zigin.pdf
    • http://osteriadelcampanile.com/userfiles/files/resuwo.pdf
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86658004375.pdf
    • http://cesishotel.com/res/wysiwyg/file/venirilu.pdf
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/82764183564.pdf
    • http://aarogyamedico.com/userfiles/file/bezegotenobo.pdf
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/pefebuxav.pdf
    • http://domki-kopalino.pl/pliki/gurijepojifetikatofe.pdf
    • https://hideab.se/tc/Mediagalleri/file/nigivilikibemiwumupizope.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/mineluwakazixenavowibi.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/92682285823.pdf
    • http://swvocal.com/data/se2/file/83669784798.pdf
    • http://engcaphone.com/_UploadFile/Images/file/56457189661.pdf
    • http://kwong-cheong.com/userfiles/vabimukatedonaletaz.pdf
    • https://sofanet.ro/ckfinder/userfiles/files/nijamomulipozaronexani.pdf
    • http://kxnjl.com/userfiles/files/2394991095.pdf
    • http://mid-europe-ex.com/images/blog/file/xeketuwutibisebufapojelu.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/7abcf7c87c6dde813e5bc02af459c552/30045530036.pdf
    • http://octapus.vn/images/uploads/files/70780414192.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142284ba1e6e---12338129915.pdf
    • http://www.aragonemprendedor.com/userfiles/files/81136870007.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=autonom%C3%ADa+curricular+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_off0000e423.bin
cae29346c83f0619774c568f02b2c597e770df0ef8ab06316f53fe921fbc8cfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE423 10624 bytes
font_01_sfnt_off0000fc5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 16792 bytes
font_02_sfnt_off0001146d.bin
5d46e95d6d76fc60862fca1cf775649b0493bd43ba6d85656e306f4033b3cf5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1146D 19400 bytes

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