Malicious PDF — malware analysis report

Static analysis result for SHA-256 7161635997a4e2e1…

MALICIOUS

PDF

95.2 KB Created: 2021-09-18 19:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a23563ac82d98b435c591a3897dc9c41 SHA-1: 68cd72f03ab99a1367234405f336c85906b094e3 SHA-256: 7161635997a4e2e15021c596a2ca20cf9951c1b7460c410405c64f005fd29a52
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the nature of the embedded URLs and the link farm heuristic suggest an intent to redirect users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://a-swiss.com/upload/userfiles/file/33175409434.pdf
    • https://cfbadalona.net/ckdata/files/45809932233.pdf
    • http://federicozucchettiarchitetto.eu/userfiles/files/setogadafulodobiwevijuw.pdf
    • http://cbcom.fr/ressource/site-image/files/88476250971.pdf
    • http://artgraf24.pl/userfiles/file/sisejapuvitutusuzis.pdf
    • http://sjzhtchem.com/upload/files/tibelamobuv.pdf
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/tokipejabufuxu.pdf
    • http://techsystem.gr/data/uploads/ckeditor/files/9439128529.pdf
    • https://ystechpro.com/nbloom/fckuploads/file/81481936037.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613adeed293db---23445202247.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/64296505874.pdf
    • http://mmsmarin.com/imgimage/file/21516169009.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/nufabun.pdf
    • http://murito.fr/ckfinder/userfiles/files/86354268621.pdf
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/luxomikepoluv.pdf
    • http://studioturina.com/userfiles/files/juvipukemoriziz.pdf
    • http://tahyuh.com/uploads/files/202109062124044165.pdf
    • https://maftplayer.net/calisma2/files/uploads/32864850875.pdf
    • http://ylpcl.com/ckfinder/userfiles/files/guwofixuzu.pdf
    • https://stillwaiting.org/userfiles/file/xorajewovaxe.pdf
    • http://cukorbetegshop.hu/files/86567035900.pdf
    • https://living-stone.lu/userfiles/files/21550295094.pdf
    • http://weorderfood.com/uploads/files/rubir.pdf
    • https://aviseco.ro/userfiles/file/bonidagevajositufe.pdf
    • http://aodaiminhhanh.com/app/webroot/uploads/files/44546362796.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=apps+to+android+tv
    • 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_off00011180.bin
7ef5772123efdb18a9cfd2c20161b099aa435996d2a6531fdb5e3705e546b4be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11180 10252 bytes
font_01_sfnt_off000128b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128B7 16792 bytes
font_02_sfnt_off000140c9.bin
701c23a48543a7cfa8e1f767f052c4cb4f9e7934fc4a12cdc6b1c9ac300eb559		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140C9 17984 bytes

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