Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb911a229549f56d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 03:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 924f27d49da7ce5de3b44f52ed448627 SHA-1: ac2f02aeb3ead3d63a4b31db917b6fe360d8ce29 SHA-256: fb911a229549f56d84e1564c2bcc008bfc202f86b346addb98082f7cd3b33963
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are associated with link farms on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a common phishing lure, likely attempting to redirect the user to a malicious site.

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://synerhu.ru/uplcv?utm_term=great+gatsby+full+book+pdf PDF link annotation
    • http://89928386.com/uploads/files/202109040527399999.pdfIn PDF document text
    • https://southafricapools.com/contents/files/96932855244.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/69324487775.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a26904097---21900343490.pdfIn PDF document text
    • https://hklh.vip/data/attachment/file/59050378445.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/84616157347.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/68917378337.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/xoguvezibupifajefuzokud.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/jurewazazufap.pdfIn PDF document text
    • http://abworder.com/uploads/files/sijudepaxofola.pdfIn PDF document text
    • http://knipia.com/userfiles/file/lanuxinuvaxiku.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/12491132611.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/xomizof.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d16655348---78104216572.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/zozum.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/xekebudasesofolixemajowi.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/fikivivo.pdfIn PDF document text
    • https://ocw.tw/uploads/files/gerobesezapuxeropagejudaz.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/kamotaneleripadijumuwu.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/wanoteroruremejifepuxunev.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/lokojeg.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/34150153553.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_off0000d9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AB 10964 bytes
SHA-256: 3dfab0e9bf85fe563ae9fb381a9643c89331a2512e61211fa9287c6613e432ac
font_01_sfnt_off0000f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 18856 bytes
SHA-256: 208aa6579ffbed369ee35f090b1624b1772e493d019e4527da83b7c5c3ce72f2
font_02_sfnt_off00012328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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