Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8a5c475e38cd0d…

MALICIOUS

PDF

74.8 KB Created: 2021-09-21 11:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: abfab2fe1789192b6e0339c5f4d9ba4c SHA-1: 160f368b01b7ef63ed6c5d298198d93360efba3e SHA-256: 9f8a5c475e38cd0d5a0e080430222771eea3cebba1584cc5f830cc6f60c7d17b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it directs users to potentially harmful websites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

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 https://queure.ru/uplcv?utm_term=judith+butler+antigone%27s+claim+pdf PDF link annotation
    • http://baigeleather.com/userfiles/file/xusesi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614675d24c518---wanotokij.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/21244813046.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2ca37db13bf860c6732e43fae62ff715/biduxubomisilaz.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/rebenujizamiga.pdfIn PDF document text
    • https://tl-systems.hu/files/files/jimamaxowuwipixuzaja.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/gamupaletalixilujowon.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/nemegobosudimekoraw.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210907/1523185499.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/6770661626.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/94355527214.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/gekutudomowosi.pdfIn PDF document text
    • http://langmypham.com/luutru/files/6051845122.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/metuduzul.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/37158063927.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/93012880735.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/2585415418.pdfIn PDF document text
    • http://net-marketing.hu/images/files/44411149302.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/ritajakutegokefinipipit.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/kepuxasiberit.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/45408284463.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/55788125318.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210908_48DA5B44D6F27B08.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1B 18648 bytes
SHA-256: 7c5737a80312b022bc68746e140906ffcfd1738da163413a555b09cb8ae84229
font_01_sfnt_off0000eb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB15 11332 bytes
SHA-256: ec29776418c8b910025275d5f06875035d572459019c903e7f6439a296a70ae4
font_02_sfnt_off00010526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1