Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3d48ecd9475d77…

MALICIOUS

PDF

81.6 KB Created: 2021-10-09 16:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 840c0be22640786b49d0be8d4bd1db66 SHA-1: 93703fb7f0d5ed7542e14be0918ae285062a02fe SHA-256: 8a3d48ecd9475d77929f02ac9322172f1fd80ea449384692e9a7a70dae40b846
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to redirect users to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern involving directing users to external, potentially harmful, websites.

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 https://smidgel.ru/uplcv?utm_term=imply+most+nearly+means
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/66818068852.pdf
    • https://marmetal.cevhertemizlik.com/userfiles/files/12137172120.pdf
    • https://planet-pvc.com/upload/files/97222747911.pdf
    • http://geredekombiservisi.com/userfiles/file/69803728099.pdf
    • http://thongthien.vn/upload/files/33737602551.pdf
    • https://saikekanglun.com/filespath/files/20210928083641.pdf
    • https://www.pessin-location.fr/ckfinder/userfiles/files/74544783837.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/9a1b11988ce9478550132ec5df7494ff/55605537462.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/4233697b6c6286ef90099242b36b4e9f/ketixet.pdf
    • http://dkyangmei.com/uploadfile/file/2021091812115573499.pdf
    • http://prosefkuchare.cz/userfiles/52050223316.pdf
    • http://jandebruijn.com/uploadimages/files/34612859692.pdf
    • https://basalyemek.com/ckfinder/userfiles/files/71773237068.pdf
    • https://kuepancong.com/contents/files/77738633454.pdf
    • http://futimisdev.com/userfiles/file/65340663145.pdf
    • http://thanhtindesign.vn/uploads/image/files/najal.pdf
    • http://disonde.com/filespath/files/20211009074502.pdf
    • https://sofupingame.net/calisma2/files/uploads/34762952764.pdf
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/jitugapis.pdf
    • https://inprovitperu.com/ckfinder/userfiles/files/mumuwofudogejuz.pdf
    • https://atlanticcompact.org/userfiles/files/kokepe.pdf
    • http://atem.sciara.eu/public/upload/file/20097816117.pdf
    • https://smsenerji.com/resimler/files/lubevutomoduzefaxalunup.pdf
    • https://www.almuhja.com/ckfinder/userfiles/files/buguwupiboxaxamanujovo.pdf
    • http://watchimport.eu/userfiles/file/1037213535.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_off0000da0c.bin
fe131bc58b13824755e5d030f7f7cc83c1dfc0ab7e543d499e8161e5cd78da9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0C 10388 bytes
font_01_sfnt_off0000f194.bin
8d51f47b7980f5bef20933817bced0e6a441c18db818d094f2a2d9950a5c20c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 18620 bytes
font_02_sfnt_off000121ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121ED 16792 bytes

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