Malicious PDF — malware analysis report

Static analysis result for SHA-256 38efe646f7914921…

MALICIOUS

PDF

83.0 KB Created: 2021-09-21 05:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b19b0707d1d87ecb9accd83247a0cb65 SHA-1: bf2c5c8be5c93bf90b6e8a99509f801a1e7c74b8 SHA-256: 38efe646f79149218e96f636e8ea2c6d9e9cb993f0c5c9c1c0ef9a2d8dda2be2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable domains, characteristic of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=algebra+word+search+pdf PDF link annotation
    • http://chinhsuasolieu.com/media/files/84409256674.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/zefopuzadalitojir.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631135854_1.pdfIn PDF document text
    • https://yifff.se/userfiles/file/gawogezibagunofomagejej.pdfIn PDF document text
    • https://rais.bg/uploads/file/kezozogo.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/85007236359.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/337137de773154e63bdf3fcc81ed6c6a/3949523647.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/19875445589.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/wuboxekuridujimagulizug.pdfIn PDF document text
    • http://klaaswester.nl/img/file/37874499764.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/44489690367.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/ziwusafiseg.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cac1c2fa6b---57964855089.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/35925948332.pdfIn PDF document text
    • https://riwg.in/userfiles/file/44402960461.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/tinijekiwomesofolo.pdfIn PDF document text
    • https://wecareprogram.org/images/file/78817551349.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/26005487551.pdfIn PDF document text
    • http://getdol.com/page_data/file/dimedalaj.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/64935089019.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/viwidukedelarisub.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/veduwarog.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/27310325819.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_off0000dc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC82 10812 bytes
SHA-256: 2258610c0989cbcd7929ef69e3f6b2769a0545f453d112bd69527db45c98975d
font_01_sfnt_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 18788 bytes
SHA-256: cde3ea4c18c810f81e1dd43a8842972026cfe3ad83e5351364cdfa24946af52f

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