Malicious PDF — malware analysis report

Static analysis result for SHA-256 d885bbb315a2d65c…

MALICIOUS

PDF

68.5 KB Created: 2021-10-02 11:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9ca9b2296db29c92c6fb4537b1ed54f SHA-1: 5e56636163b1f3cc67785254be3278426bbc6694 SHA-256: d885bbb315a2d65cee0fc7e05b58af1888800dbd311f121a1834bb0539f0a88f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URIs, including one pointing to a raw IP address, suggesting it acts as a link farm to redirect users to potentially malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final destination and host multiple redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://smidgel.ru/uplcv?utm_term=a+barred+owl PDF link annotation
    • http://brickchamber.com/ckfinder/userfiles/files/11961102137.pdfIn PDF document text
    • https://tivicom.vn/upload/files/lasapomibajipeneg.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/89348887215.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/61330588321.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/86937045660.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/lokubukazaxobeku.pdfIn PDF document text
    • https://mk-pamyat.kz/uploads/files/salixirujakazegozoju.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/13058730034.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/3843619994.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/minotojez.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/falakifiw.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/53589430099.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109072204297269.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/numebotenunilikadajuvanil.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210918052652564.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/25899501417.pdfPDF link annotation
    • http://nissanotogovap.vn/uploads/images/files/46588038816.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144205e4ce7f---89152230465.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/pilifu.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/58011787840.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/14742203479.pdfIn PDF document text
    • http://hrudolf.com/userfiles/45532868311.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_off0000af24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF24 15412 bytes
SHA-256: d0763016b280b978883d0a20252283d2e56eb7b1265c061f90d4b49f2bd66740
font_01_sfnt_off0000d656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 9984 bytes
SHA-256: ee275515eafa6c66a187323aab7baf57dabe59b5997e13f24194354cc1dde18d

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