Malicious PDF — malware analysis report

Static analysis result for SHA-256 3660ad03b6188f6b…

MALICIOUS

PDF

87.0 KB Created: 2021-09-13 03:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b03a3022a8bb23e4c8674e0dec60f083 SHA-1: 6ec991898317b3c1854f3d058bc14e3becaa03c0 SHA-256: 3660ad03b6188f6b654d42395c8655ff1be8dbe1d0959ef75c120070ae27c371
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or serves as a phishing lure. The presence of numerous external links, many pointing to PDF files on distinct hosts, suggests a link farm designed to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the PDF structure and URL patterns are consistent with malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hcbarrett.com/user_area/file/47539066993.pdf
    • http://phoiinnhiet.com/images/uploads/files/5256726522.pdf
    • https://internationalmedia.com/userfiles/file/kovajogunozopadenerijo.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0ed767c5---tesataripitufijasow.pdf
    • https://dongciao.com/uploads/files/202109011836325535.pdf
    • https://allegypttours.net/userfiles/files/30916077024.pdf
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/vupofenubakujivijon.pdf
    • http://laclonghotel.vn/upload/files/32691986397.pdf
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/pizebifezezeruxuti.pdf
    • https://spcinternational.in/ckfinder/userfiles/files/vatoxafutodineg.pdf
    • https://cytokin.ca/upload/editor/file/viserotu.pdf
    • https://insinkerator.us/images/uploaded/file/zezat.pdf
    • https://ceccarmehedinti.ro/userfiles/file/ninanuwojazezevog.pdf
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/74060784020.pdf
    • http://wingmanresearch.com/userfiles/files/tiwekabexexozabitu.pdf
    • http://slovbau.sk/test/userfiles/file/lafekimuzusoliwadil.pdf
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/bozoba.pdf
    • https://qwert5.com/psum/admin/userfiles/file/bikerotebakobasasiw.pdf
    • http://4grd.com/cmsimages/file/65092476113.pdf
    • http://toroisg.com/public/images/files/rebapalagujezej.pdf
    • http://taihegas.com/filespath/files/20210905002043.pdf
    • http://ural-resyrs.ru/data/file/komedatisexa.pdf
    • https://merohamro.com/ckfinder/userfiles/files/renoba.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=samsung+s9+vs+iphone+8+plus
    • 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_off0000ec81.bin
5e1b2306d75b157e9d5ae2e8401832fe5d69ae278cccdfd19e2a04a79886130c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 11120 bytes
font_01_sfnt_off0001063a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1063A 16792 bytes
font_02_sfnt_off00011e4c.bin
31d612e00bcae37f0bdea488c9211458d0a71630a9589427af8125769b1bf0bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4C 18652 bytes

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