Malicious PDF — malware analysis report

Static analysis result for SHA-256 213b7df61c638b79…

MALICIOUS

PDF

76.8 KB Created: 2021-09-08 21:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47143c974b605f234b452af006336e81 SHA-1: 37e10f2a03516087ddbd49bb29a6772120395c4d SHA-256: 213b7df61c638b79c9ffe9eb3bc96b87709ef27a5c4f176a3028affe161b0143
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The presence of a link farm on disposable hosting suggests a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ketchas.ru/uplcv?utm_term=agneepath+watch+online PDF link annotation
    • http://hysansam.com/fckeditor/userfiles/image/disijuxebot.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130227d7b637---81446013392.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/gidijitinaf.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/tawerarusewawudoz.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/20930867868.pdfIn PDF document text
    • https://agros.net/uploads/file/42776910126.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210906060921.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210902_134205.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/28226321517.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/gasovolowaxejikapigidudot.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161349bb9ee6bd---92671316116.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/nugopafogokujadifeporekiv.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/8205380516.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/siginekufifi.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/fukedusuwitupikakojem.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/wufuwifejufufiz.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/gojedolisepujaku.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/koxuguvuvalirovep.pdfIn PDF document text
    • https://architektor.ru/uploads/file/refofi.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/zupekagefawujapuponada.pdfPDF link annotation
    • http://acrclubinversores.com/files/galeria/files/43386586254.pdfIn PDF document text
    • http://hflchw.com/upload/file/86855043922.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/jawakapixuzek.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/54905489464.pdfIn PDF document text
    • http://gdgom.com/upload/file/210904073309905895nwgbmdp21sb6.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_off0000c987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC987 17148 bytes
SHA-256: ee81853a7c93b84374fdada8ab0cf60766b1d0066c4352164c7399148b21f8f1
font_01_sfnt_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD2 10452 bytes
SHA-256: f96a42ccd95208b0152731ac662f09c13c780549dd068724fce591e28f1d0d32