Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3ca9ac4e443381…

MALICIOUS

PDF

73.2 KB Created: 2021-09-16 21:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00b1442f712ed6f0c1d11e98ee7abe1f SHA-1: 57b4640c90bc802b1265a66b877b80b305cacdb0 SHA-256: 5b3ca9ac4e44338108cbe3ca3d2e7771827b9e5fb017f6fc6174549a927e1e82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm or phishing lure. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://laborke.ru/uplcv?utm_term=live+channels+app+android+tv
    • https://12shio1.com/contents/files/43116908864.pdf
    • https://urbanshapes.in/userfiles/file/19044309805.pdf
    • https://chulintemple.house-well.com/CKEdit/upload/files/dabupilero.pdf
    • http://vssteel1999.com/ckeditor/userfiles/files/20175009073.pdf
    • http://holzbau-napetschnig.at/vubivolotamo.pdf
    • http://joyearland.com/ckfinder/userfiles/files/59860727328.pdf
    • http://greatwalledmond.com/ckfinder/userfiles/files/56452402718.pdf
    • https://fsbulletsandbrass.com/userfiles/files/wofugamiritomov.pdf
    • http://ctnphrae.com/ckfinder/userfiles/files/95774562712.pdf
    • https://ylwlgwadmin.ylwl.cn/upload/files/15577987800.pdf
    • http://infrabud.eu/fckpliki/file/36015719256.pdf
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/41995317620.pdf
    • https://airxps.com/userfiles/files/19673021877.pdf
    • http://xaydunglenguyen.vn/upload/files/c45c82.pdf
    • http://getsolarnj.com/userfiles/file/nigub.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/bubox.pdf
    • http://rigdrilling.org/userfiles/file/retotawatef.pdf
    • http://4chan.ro/UserFiles/file/naninarakog.pdf
    • http://scro.ru/pic/file/14452268007.pdf
    • http://gu-bo.cn/uploads/files/metiledasivazumum.pdf
    • https://groupunsur2.com/contents/files/91466212919.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/pumabukivuxi.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_off0000bd4a.bin
ec4826d4a7c96260c35d05ee45a53c270461e9b991f266d7288b56920fe6f8c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4A 10632 bytes
font_01_sfnt_off0000d58b.bin
0ea51d8c7bd4b02436c6588519346023d460224692976a7aba998a00ecd6260c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD58B 16364 bytes
font_02_sfnt_off0000ff9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.