Malicious PDF — malware analysis report

Static analysis result for SHA-256 585445fe53adb355…

MALICIOUS

PDF

70.4 KB Created: 2021-09-16 02:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 619c9638eb0b6c6c6125c99a9ecb9574 SHA-1: 8bb532ec35abc40f839db0b5e892ef04960fe003 SHA-256: 585445fe53adb3552dbe56726342729e5378f6d207e49eeaba8dcdf0a91d9e3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=libro+after+we+collided+pdf PDF link annotation
    • https://kluchar.net/klucharnet/images/file/rorubaw.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/74558167359.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/tilad.pdfIn PDF document text
    • http://terrietanaka.com/library/files/40002831057.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/41973540707.pdfIn PDF document text
    • http://redactron.com/userfiles/file/begalimefim.pdfIn PDF document text
    • https://cubic.is/userfiles/file/76105752892.pdfIn PDF document text
    • https://guijek.com/userfiles/file/44805881964.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090519561573499.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zizijiguverefuvosojiwemo.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/888e2f8a1d9704475a9cb70deb710449/pujemavisinif.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/boriwigu.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/zobabejukonetifi.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210908_0F5A397EB4BA6E47.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/zujujag.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/66252071611.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/zuzinujijo.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/64138330623.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/35569628183.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e6f752212---sutulolarafututokexata.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/29992169557.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/wogubupelaf.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/dakokesutonekikesi.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/13050545796.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_off0000b194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A6 16556 bytes
SHA-256: 5fb59a1eb7cdcaa42b96472796e8db9d8461e69668c73b755c9031801bdd6815
font_02_sfnt_off0000f432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF432 10524 bytes
SHA-256: 9c00965b167af2998310af65f2967e387ef1e65cfe564dee393c0ef08f7e8cc3