Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b6af66597331c7…

MALICIOUS

PDF

80.4 KB Created: 2021-09-22 20:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4995d376f8c9fc0566db1a6397d8f4e3 SHA-1: 315bbd8b2471d780064642d6f4ed43ca361d080f SHA-256: 66b6af66597331c762a62ddc81f9f3e2281ae6edd9f070e032882cd1bd9fce6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an intent to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.boldino-hotel.com/ckfinder/userfiles/files/38577007245.pdf
    • https://spvi.cn/filespath/files/20210913075034.pdf
    • http://lustigersteirer.at/userfiles/file/digufapotimatasuwapolo.pdf
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/wesoperuzotabuzowuzukos.pdf
    • http://year-c.com/upload_fck/file/2021-9-6/20210906095250290219.pdf
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/jifinuvonapusivirufuwativ.pdf
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zivubegefobagujifinefabeg.pdf
    • http://groupelamiri.com/uploads/FCK_files/file/93131036983.pdf
    • https://greenfins-thailand.org/uploads/file/4530593957.pdf
    • http://ieeepes-thailand.org/app/webroot/files/files/solefegez.pdf
    • https://fivetc.net/uploads/files/41030830864.pdf
    • http://itexpertdog.nwoasis.com/upload/files/gazidadilosi.pdf
    • http://esistore.de/userfiles/file/kuveji.pdf
    • http://icmasistemas.com/userfiles/files/12486784996.pdf
    • https://arnetbilgisayar.com/upload/ckfinder/files/rugidusutiz.pdf
    • https://doctornhospital.com/banglanews24/editorsfiles/files/sikebuxu.pdf
    • http://studio-castiglioni.com/userfiles/files/wozujigipolefaretu.pdf
    • http://highlevel.pl/userfiles/file/bavugisafefad.pdf
    • https://sahodayabbsr.com/test/fckeditor/file/16806457691.pdf
    • https://korovin.org/site/img_ufiles/tolonu.pdf
    • http://musicandyouapp.com/webupload/editorimg/files/fapamavudumifipojaduzoki.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/c99076df65a00c4c81cf250cd15b6eea/fipizakumotilesurabumuj.pdf
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/14227146057.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gta+3+apk+obb+data
    • 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_off0000d5eb.bin
a60cdd196d9d4c93e79caf398427da0cc9bef2b7ba137760d15a38a688129f28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EB 18396 bytes
font_01_sfnt_off000105c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 16792 bytes
font_02_sfnt_off00011ddc.bin
450f04a794c1243220cae01629ebd0f55e23841916b545c8b9e1ca0b3cd8bcb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDC 10184 bytes

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