Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc56455e886f94c…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 02:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 03d571f05c19af6f3b50ba5835eb46fa SHA-1: 205c1102ec50e23310f29cfb6d9939c7fe1dbf13 SHA-256: 8bc56455e886f94c66f8a1823dd5ba65d7101b008d47f3bdd00119581ee4751b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest an attempt to redirect users to malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=sniper+tool+apk PDF link annotation
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/sobinigamanur.pdfIn PDF document text
    • https://designclarf.it/file/guwezezosurijujunazit.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/papigaxewoxosizikoga.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/xijurekevimotaru.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/mijudujinabawopodata.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/dorepepubugekotudobu.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/56992611375.pdfIn PDF document text
    • https://gencatakan.com/upload/file/bovufuruzerasiwamaz.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/dowekizumovil.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/nogoliverikexaxuzi.pdfIn PDF document text
    • https://melz-feu.ru/upload/kadodofopigivivi.pdfIn PDF document text
    • https://kimansion.com/uploads/file/26150660064.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/92953262717.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161429fc1b4319---monafapekawodonedovinenib.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/kirabi.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/59148312536.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614122aa754c5---6110897700.pdfIn PDF document text
    • https://actorconseil.com/files/file/nevuw.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/gusala.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/lirenulutokovagazedi.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/15507446809.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/53185760217.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/mawapaxixabolatulonukelo.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/28857352286.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/wuminegigazoziketigi.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_off0000de3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3D 10244 bytes
SHA-256: 565b01769070c19d43c74be4ba3e66f4f244c099491045be2f68b1a8a2f71871
font_01_sfnt_off0000f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D73 18468 bytes
SHA-256: cb1a15c6f78d208a3a768ccd8a4611b27b6e1ee0ebedb46a8cf1445fab54d835