Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb9b1a13d7627fb…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 18:38:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dde7d2443894f082bbae4e8e7605935f SHA-1: 6f0bdcc924ef167d4065823eb232e3843ccd6607 SHA-256: 8fb9b1a13d7627fb86727602c2eb3f140467e41bd1e2507db2dcfc9532605bc5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The PDF structure itself is also flagged for SEO link farming, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maximatrimony.com/ckfinder/userfiles/files/senokefigisivilazite.pdf
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/35544878043.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/316f1de420370a3c21c8bd06b0a8379a/virasedowaxoxumilokulik.pdf
    • http://newgatedesign.com/Images_upload/files/dujexofoliru.pdf
    • http://www.premiumimport.nl/ckfinder/userfiles/files/88771049046.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/55523932296.pdf
    • http://www.dawnrotaryclub.tw/UserFiles/files/17810826139.pdf
    • http://blesk-stroy.ru/userfiles/files/fipuzemipekufitokokonej.pdf
    • https://kaimano.it/file/80565480181.pdf
    • http://pamatudarbai.lt/ckfinder/userfiles/files/55510642355.pdf
    • http://footstepfloor.com/upfiles/files/79564955108.pdf
    • http://nieruchomosci-swidnica.pl/userfiles/file/35176420626.pdf
    • https://km2804.com/ckupload/files/31160058992.pdf
    • http://speckrepej.com/upload/file/90717050175.pdf
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/somataputuporoberat.pdf
    • https://duel.pl/userfiles/file/9501990740.pdf
    • https://suprastoc.ro/userfiles/file/14169037368.pdf
    • http://tiramisu-o.com/yamituki-n/uploads/files/murojenige.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161397aa5afcde---segirop.pdf
    • http://myphamasia.net/upload/files/24873779826.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/65877560642.pdf
    • http://esistore.de/userfiles/file/nozef.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=xiaomi+mi+box+s+hotspot
    • 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_off0000ce76.bin
bde9306a36efe5e18899003e48fc72083c76c9c26d361b941cc6442459561deb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE76 17784 bytes
font_01_sfnt_off0000fc93.bin
0fdbf1bcce5ad9c463880b2937108ff6916cbf01cc4e7a7373fb382cc11ed950		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 10384 bytes
font_02_sfnt_off000113e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113E2 16792 bytes

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