Malicious PDF — malware analysis report

Static analysis result for SHA-256 33025fe0486ecb52…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 20:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f9cc2faa631fd7de8d77ba66d9d6d563 SHA-1: 0d283550bc9ecf5c0a3f8085bde7b92e6a27f61b SHA-256: 33025fe0486ecb527b85ef48117c3eab20940fe60bca169b039d0d15d869abc4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains a large number of links pointing to disposable domains, a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm indicate a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/lalexulited.pdf In PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/34271213610.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/xujesumuwimezuzevib.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/38582829396.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/gesesam.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/jewubazabisuwem.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/fonibunakusokugutoxugi.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/tuvuxule.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/46940031678.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/65851782867.pdfIn PDF document text
    • https://arerp.kr/data/file///42887511961.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/bovizevojudatot.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/lixexodesonodugusida.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/rojimelus.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/24154395913.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/tepofifu.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/55403645075.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/maxekotaparij.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f4b03812803ce8dec0c5ec4d739ceea4/gomotoludozonu.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/25435896935.pdfIn PDF document text
    • http://charontrade.hu/data/file/10902686195.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/bipewidojokusivawinek.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/53696346441.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/89863577752.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/1c437edd03aa6b9f3716525ff2491749/dovubepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=send+text+to+pc+from+androidPDF link annotation
    • 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_off0000d84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 10744 bytes
SHA-256: d78c80790c6d96c36b9699a37d08f274c970d34645fa56f8c475162663912bae
font_01_sfnt_off0000f10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 17484 bytes
SHA-256: 4218a3233a85363bd8cb7dfe2990badde758b559e4e6aac282f64b1130ff04cd
font_02_sfnt_off00011e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1