Malicious PDF — malware analysis report

Static analysis result for SHA-256 2443386cf1ba0984…

MALICIOUS

PDF

73.1 KB Created: 2021-09-23 00:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 78704020a94055e603c9709fc3f61d1f SHA-1: ae3b982f5333f1e0829a513c54a0fedaa60328bd SHA-256: 2443386cf1ba098443a531c502fa781fe2c6613dcd49dda8f1ab91f74b165020
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, preventing a more specific analysis of its lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://peoplefoster.com/pliki/nifumikezituxina.pdf In PDF document text
    • https://investkwik.com/userfiles/file/buvamoxupaginizibik.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/99355129777.pdfIn PDF document text
    • https://ottopianos.nl/files/tojevovivid.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0de4059ae---85014859469.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/dapemof.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/magamurevugasudi.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210913175220.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/44045920928.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210909_4C9C70F24087067B.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/19868313814.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/maragomarakupinufeneburax.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/mizufezifuxewana.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/virovajowedozofamabilopis.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/moxinigulogefapunode.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021092305003280554.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/devenonerozubopidopaxawu.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/65882722750.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614118d92661a---87895115632.pdfIn PDF document text
    • http://xtra360.net/campannas/file/xopawetu.pdfIn PDF document text
    • http://tochalco.com/uploads/files/11584279780.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/668a1a5f44aee963803e0d2aa4bc86d5/beverezanilunipuxoteg.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///duxegivomiduwivaxapapu.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/kovaxuzowud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=live+cycling+manager+2+apkPDF link annotation
    • 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_off0000b3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D0 10680 bytes
SHA-256: 3ee8d45e72f84ba6f8de0a9fea4190a0299cea32a02fb2ed09fa07f75a04cca2
font_01_sfnt_off0000cc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 19864 bytes
SHA-256: b7ae1718e6297e8f00ed22d106bd1a5849d90882e7045a8429cf1a97a0112248