Malicious PDF — malware analysis report

Static analysis result for SHA-256 933d86cd572ff10a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-10 05:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 58bd7d5fea0457cd23deb46ae2b0738b SHA-1: b5b8c86610c4dee2f2705bd78aeaf6a8d8a5544c SHA-256: 933d86cd572ff10a94f1c20735397bae47699581fcce6971dbf3bea6906d3d85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://philabc.ru/uplcv?utm_term=the+scarlet+ibis+short+story+pdf PDF link annotation
    • http://skkl.cn/filespath/files/20210904000308.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/fikefonarubo.pdfIn PDF document text
    • http://tcihk.com/userfiles/1822141055.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/88796600823.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/jobuv.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/zufexomidika.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/v7ei213ulu0fh7o2hhusee0aj6/19651304966.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/pepulemukexuluvati.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/wamojudiruzomaburosazogox.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/xibijafefukekukurazu.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/govejejudusevov.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/36327027920.pdfIn PDF document text
    • https://people11people.com/uploads/File/gemefewibinepo.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/80596636723.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/babidoleke.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/vupinaremoluse.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/29553720526.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/80019869598.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/fudexixovuzewegugu.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/41604001839.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392f1ddc988---66562364030.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/52716024318.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_off0000d429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD429 17892 bytes
SHA-256: 572685b752e2f5acdc44f313a6d21555458bf9ecbfc6ac0884a040e06e944014
font_01_sfnt_off00010280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A97 10832 bytes
SHA-256: 8db103231c107fb47fb7e8edc62e2c11834af0fce2b270b6b0a6c7dfa5c57ec3

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