Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82e01ee7c5baf76…

MALICIOUS

PDF

69.3 KB Created: 2021-09-24 20:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 51771e58a8bbd772a2430f7bc780646d SHA-1: 887cf6cd745fbea84ff1e6d9ad45a00d099669fd SHA-256: c82e01ee7c5baf763326a92617dc2375caa1b8a5baba8931c84dab0920e575e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crysiq.ru/uplcv?utm_term=gta+5+download+for+android+no+verification PDF link annotation
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/97948136871.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/gazolebemesal.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/75340113121.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/84306560136.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/29632340864.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/gerigegikedodibibokoxaga.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/jotudi.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/rekanimajabamitidezuk.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/38464393724.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/29059844334.pdfIn PDF document text
    • https://tamm.be/_files/file/77231216116.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/kutasijigu.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/3030727475.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/dulupivinamufupozup.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/56630778765.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/40312183594.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/fefijojirodupukodumofaf.pdfIn PDF document text
    • http://eko-uklid.com/files/file/bibutavuxu.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/82579569053.pdfIn PDF document text
    • http://chieucoingason.vn/files/sefakumekivofef.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/72699441050.pdfIn PDF document text
    • https://guadix.co/ckfinder/userfiles/files/lupawikomudubajog.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/pesovu.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_off0000b00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00C 10624 bytes
SHA-256: b858843784d2412d2b50dbc92e93ad7d63a3436ad753dd0f473de8d27e543737
font_01_sfnt_off0000c897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC897 14700 bytes
SHA-256: aefb9c0a9c29b756db093f319c5cb554b726f5759f0ed6ab2ebc2ee19fd2f075
font_02_sfnt_off0000ed6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1