Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f8f9c5554fc4d3…

MALICIOUS

PDF

79.9 KB Created: 2021-09-22 14:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1fc7c4f0e076541b02e9e2a8adb54135 SHA-1: cd479dd4d1a4e0c64373a9c8aa70e67b5ba3bf88 SHA-256: e8f8f9c5554fc4d3f0ea41825b7e1f2967d5460288569e7cbe9b68f1f2444eb1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy of using disposable hosting for a large number of links. No scripts were extracted, but the overall structure points to a phishing or scam campaign.

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://rungrawin-itt.com/userfiles/files/mowapuv.pdf
    • https://0922.sproname.com/files/userfiles/files/gaxerezatanelapikemigake.pdf
    • http://viorina-deko.com/images/file/zabetapa.pdf
    • http://print-printonline.com/ckfinder/userfiles/files/9941129401.pdf
    • http://abcgsgeds.friendship-match.com/upload/files/20767757173.pdf
    • http://hndgyl.com/v15/Upload/file/202196926393775.pdf
    • http://hotelgiottotorino.com/userfiles/files/54920903310.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/v1dn5h8bf32kpocvtcdr8rpk44/bovolozofo.pdf
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/navorogesadorokuruzeveta.pdf
    • http://www.photonics-science.com/ckfinder/userfiles/files/23804711617.pdf
    • http://vom-ragnaroek.de/uploads/file/fagapidezil.pdf
    • http://abwcolley.com/uploads/files/xovajulewigelejodol.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/39756693141.pdf
    • http://chongthamphucthang.com/images/news/files/zimimutemukexujegasevu.pdf
    • http://vallovin.it/userfiles/files/62124980503.pdf
    • http://www.farnostbobrova.cz/ckfinder/files/57602106458.pdf
    • https://micsys.in/userfiles/file/zigukolojigokunaberemola.pdf
    • http://vititanon.com/user_img/files/wodato.pdf
    • https://srldirect.com/ckfinder/userfiles/files/96733943251.pdf
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/fudiza.pdf
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80645903175.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/656b23e814c714eb22e8e5d5ddaa45d5/62218890309.pdf
    • https://hkfew.org.hk/ckfinder/userfiles/files/lijoxuxojituvovulijumoti.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=play+fancy+pants
    • 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_off0000d402.bin
debd1faff0dd099628de6a4ee59c968276261b63a123c1514dc7c4a5c3bbe54c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD402 10144 bytes
font_01_sfnt_off0000eaeb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 16792 bytes
font_02_sfnt_off000102fd.bin
c5bebec92479dd4c24f49c278e052374e17e1a672532cd5a3c973336b6c61c14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 18472 bytes

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