Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22df3333d7424d0…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 02:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cc3ff7e16cd91172dd0b1e91466f245c SHA-1: 6eec2989da90c97a9bf90891ec0757e6f6892b85 SHA-256: b22df3333d7424d0c877d3632e5010e183485ed42b3bdbda097f93eb4aacb997
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-based lure, typical for phishing campaigns, and contains numerous external URLs. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URIs and the overall structure suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://infrive.ru/uplcv?utm_term=only+for+one+night+full+movie+watch+online+free PDF link annotation
    • http://ylplj.com/ckfinder/userfiles/files/43543397810.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c1283d678---lamitorabututizuni.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/xiparugevimikijilugip.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/15971363377.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/lajetaboreginogamufu.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/7121992469.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/33633836660.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/19706759995.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/gojudazarakez.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/bojifezakolosiwigop.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/1899379732.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/jabukuwuwamazenuwopojeja.pdfIn PDF document text
    • http://suaups.net/userfiles/file/59915819096.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/53327899963.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/vubomevaxira.pdfIn PDF document text
    • https://camphacement.vn/upload/files/rigitetujafezamedejiwi.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210907093057.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/34766113699.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/94015260658.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210919_101758_191.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/nudaxexezutozu.pdfIn PDF document text
    • http://melvin.cz/data/lubusowesijidup.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/75739199544.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/pufosupewamugeduvixeguse.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/87039376868.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/4695673952.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_off0000b06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06B 11008 bytes
SHA-256: 872918b7eef19280ec7e8084068fd6ab42e7643d56edcf0824706997daac7c7e
font_01_sfnt_off0000c9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E6 14356 bytes
SHA-256: dea4b498e0448b0ad812f86476d49186c355ce2640bcc63ae7e5e5f65336524d
font_02_sfnt_off0000ed98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1