Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d17826c7be02f64…

MALICIOUS

PDF

89.2 KB Created: 2021-09-16 05:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8979b8334b13efba596b2b74a10f836 SHA-1: 01008ed3aa7385575a22e781519ce5eeae099e8d SHA-256: 6d17826c7be02f64662d6cbc5f0821d228ab84140e10f8b4dcc9858c832c3b1f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for distributing malware or conducting phishing campaigns. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/jidovusifetejebegigiw.pdf In PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/45418577113.pdfIn PDF document text
    • http://demkapi.com/resimler/files/jukexufazejujereza.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/33718475764.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/bikatavebexuvozes.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/69189169994.pdfIn PDF document text
    • http://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/42441805573.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/fusedizixefa.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/mekepugifuroxetir.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161386438b53ff---1499543565.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/25461674702.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/werepa.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/95388864796.pdfIn PDF document text
    • https://tekartltd.com/upload/files/68718100143.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/61469380951.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/3003324213.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/96034124540.pdfIn PDF document text
    • https://jjpremiers.com/files/39933722427.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614280e9635c2---51846484675.pdfIn PDF document text
    • http://ge-mak.com/files/96208304263.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/logererokirubiguzikunipab.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/punemef.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/zubedi.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/26330262345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=happy+death+day+to+youPDF 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_off0000fd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD02 16940 bytes
SHA-256: 6a9c449f8b093ce9320af3fa0b4a09ff920e79f252940ba982de98646cc2152a
font_01_sfnt_off000128a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140BC 10184 bytes
SHA-256: a9f109a3e2f99f4736f83708d66b4a604aa9f04267c8b818efdf1a0a885ec8fb