Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65ef1a05967c2ff…

MALICIOUS

PDF

75.6 KB Created: 2021-09-12 16:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b74f27029b128d86ad37bb79204e654c SHA-1: 39e09fb10299e9093346662c5030eaedf178425b SHA-256: d65ef1a05967c2ff3378b086e02dfe643b216b74d0404783bbb8abd86e08d547
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to link farms, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure designed to host many links on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=clash+of+clans+real+mod+apk PDF link annotation
    • http://yurisolomko.com/userfiles/file/lokowotifitu.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/97704924115.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/59314014829.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/xitebuzubuxasalesux.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210901175527.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/gumuxufojojosam.pdfIn PDF document text
    • http://hangquangauto.com/files/89238139204.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/28039608201.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/tapuwinonoturuse.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/nafulidupawewija.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/42840418244.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/madigorixizonolor.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/tewosawap.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/30098047678.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/siresipu.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/tumulijabemejivuna.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/46026776831.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/jaxare.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/zasoribusinadebizawori.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/jukobavidinipirabu.pdfIn PDF document text
    • http://rvhifi.cz/files/file/mukururure.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/649822e75d5147861fba2ce78aa66a96/24219229815.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/xoveboxuwowa.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/83649413610.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_off0000c6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FD 10816 bytes
SHA-256: 074d1c161b3543b8bd9b648223f5ede2fbcc0c3f78c48694a76ee6356f43d84d
font_01_sfnt_off0000dfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 15980 bytes
SHA-256: 89c7ed74c68d499ce7842e7d546c87a3856394a57da0e85456d055f39321c654

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