Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ad5206052df178…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 01:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5ceea0ead08c4cd5b616a0d0f3a4938 SHA-1: 33b77df6b6e9a426e4ecee3c9cc38daa72c3204d SHA-256: 63ad5206052df178a9a53b21af23da9be14186c6b9d651addecbe0b5c32e8f57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm or phishing lure. ClamAV and ML classifiers strongly indicate maliciousness, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=subtitles+translator+apk PDF link annotation
    • http://101-games.ru/images/uploads/files/lutegesi.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613979d0a20d2---44313569033.pdfIn PDF document text
    • https://nocrime.cntwn.org/ckfinder/userfiles/files/futuwujoju.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/wefifaranumivatekepofili.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/zidixatonowotibigoseti.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/65280304381.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/mapudiloresegavojerukum.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210902_B25CD38CEEEE7655.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/gevetojuz.pdfIn PDF document text
    • http://topas.lt/userfiles/file/58694119777.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/lelukojejifozedewijubu.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/fukuwuzosijol.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/dedosoliguwakiputalal.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f7484ced3---lufofavijodozosexileg.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/36013759832.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/15527489204.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/98127245370.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/nijudu.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/32105176814.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/17720624123.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/89756417271.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/87197453866.pdfIn PDF document text
    • http://le383.com/uploads/files/44412565780.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_off0000d6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B3 18560 bytes
SHA-256: e2fdb7fa3a7b505a44d02da977beda5a8402d0810dc61483488cf26eace2f0c7
font_01_sfnt_off00010796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 10652 bytes
SHA-256: 9c306f6f118760ef0687604c5adbb23e7400d1b34bba259e2bf0b4898cd5afe3
font_02_sfnt_off00011fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1