Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f3bb452c3187db…

MALICIOUS

PDF

75.1 KB Created: 2021-09-16 02:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7beed0819c7e74d14a551979761d4daf SHA-1: 50a53f5df7e1fbc296f40703e15f3f1eeebea620 SHA-256: f9f3bb452c3187dba6d11898c28ecacee68e14b7921830141ecd6225740d96ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of external URIs and the overall structure suggest an attempt to deliver a payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=imo+video+calling+app+download PDF link annotation
    • https://derfo.info/resimler/files/44685076979.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/12623701074.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/j3pvsfub3opj6vqhpaq0tvi51h/91173482332.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/55663816522.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/zuvujelolepewomazuju.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/xizukuxedugowimedevosadoz.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/degeragakuzazaxab.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/doxukitukitiwa.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/40229898086.pdfIn PDF document text
    • https://fuoriscena.eu/file/sizezafoxaf.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/pubezo.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210904141118.pdfIn PDF document text
    • http://thevale.us/userimages/nobiw.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/wunuzasome.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ss9f5vebop76ilk9qvt0ap0h7j/minuzos.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/44294188225.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/46506034502.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/53905790436.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/75476974104.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/povoxegajaselokufigavuf.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/42341028806.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/85486452485.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/81272831087.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/10360612435.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/finabaxagemev.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_off0000c318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC318 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2A 16736 bytes
SHA-256: 8514e69f975510e303deceb3d0f2487a806394d08fc149b4695ece4e4da7073f
font_02_sfnt_off00010685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 10596 bytes
SHA-256: 76c60ba193c8561453d15312e0576d22586e098318e1bbef4a0e5666cede3ee5

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