Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf21a219bec5af8…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 18:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e2375604ab1a1acce6e6f175d085323e SHA-1: 4ce6f76335d288e99ae595491de2e23ff6111e8d SHA-256: 9cf21a219bec5af8c676dcce4106ba78388a2aa5210a277f10dc20dc83a445ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=how+to+download+happymod+on+ios PDF link annotation
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/gikeminaf.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/loviveb.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/1341076280.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/56648469108.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/mabetosoboverebomusetoj.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/25582202039.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2ef74e336---jokivuvuxen.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/xuwinabomiv.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135af9ba9da5---15104673817.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/dibatubedusaxedavox.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/7200277213.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/navakelunaduma.pdfIn PDF document text
    • https://lorus.rs/files/budamuxuludulizuraxo.pdfIn PDF document text
    • http://skncn.com/u/files/76706378979.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/muxisofakajinoxu.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/lagutazajijasega.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/gikumomidus.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/54939255865.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/10116942204.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210909070651.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/fasamubasixuwe.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/8896322357.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/64752385104.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/88036532759.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/napovezulaviwaxovovo.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_off0000deb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB8 10616 bytes
SHA-256: 08b5805432ad044888e7040dfe7715897b99c3c6b999db12d828ad721226ba35
font_01_sfnt_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED6 17584 bytes
SHA-256: 5cac500d6fa3d6b999ba112ae5358a69b8ff449cf909fd89526840e07449ca85