Malicious PDF — malware analysis report

Static analysis result for SHA-256 85adb5a25226b0d4…

MALICIOUS

PDF

80.8 KB Created: 2021-10-06 05:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c13bbe26a7bbc600b0f54fff46e148e0 SHA-1: d5024b36f90a1ded4a98962a4f3f020995efddd6 SHA-256: 85adb5a25226b0d4f8e2c539b49c703839858dd0aaaa516f3504be5f0aa37df7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to redirect users to malicious content. The PDF structure itself is also flagged for containing a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://medvor.ru/uplcv?utm_term=what+two+color+makes+blue PDF link annotation
    • http://baaningdoi.com/file_media/file_image/file/bizabomewarogesagiziju.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/2orc92fjgoq87693l4pa12lm86/gojetaz.pdfIn PDF document text
    • http://www.sczct.com/up_files/file/womuxogivunugufixidarep.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/dopajokumam.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/vaxogubuzevovalinuj.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/44771820691.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/febepenate.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/80777992418.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/vexinoxerutavaraxijixi.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/22719521676.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/56247505582.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/35143461690.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/21348920386.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021104323136484.pdfIn PDF document text
    • https://thehouseproduction.net/file/zejazuginorupusobage.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/82803187352.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091101384973499.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/80489666119.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/muvilazogaf.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613242c98aba1---58702794277.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/91244713894.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/puserinaritazinujilolige.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/rakawamej.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_off0000d5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD5 10708 bytes
SHA-256: 95568cd17a4a4fa5d328040a01548453eda511249fbb297fc2332159d3df3568
font_02_sfnt_off00010692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10692 18240 bytes
SHA-256: b38757b24bc9a29ca8fedd8066db1df725027c028659fedb1554541def52252a

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