Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bed2468fbcd5f9…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 06:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ba142e1fa34e8a320b1e88cb76ee4a45 SHA-1: b8d2e18592038ddb1f6c1013deea308e0f6e4059 SHA-256: 90bed2468fbcd5f90f2ff5f1c5e734feb6924942a89dbe29a563af5834e34abd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high number of distinct hosts, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://olguanaokulu.com/upload/file/11938243303.pdf In PDF document text
    • http://poltinka.ru/userfiles/file/tegawigivupewagoj.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6de995e0---29169990170.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/7566446714.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/86728357035.pdfIn PDF document text
    • http://juha.be/_files/file/51069537672.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9109e2c66---19839671020.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/24927901565.pdfIn PDF document text
    • http://congluc.com/upload/files/visevilekowuf.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/zafojure.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/tolemibez.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/74509943433.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/zufubafez.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/95419727838.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/40109680586.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/zegafotupaw.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/jejagijebalojukuzoxuvu.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109051704354928.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/6138382391.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/67580694353.pdfIn PDF document text
    • http://nature-revive.org/files/file/4615650129.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/nawikow.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210912031631_ZGFwb21pbGlsdQ==.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/8621543523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=reels+download+from+private+accountPDF 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_off0000dc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1F 17260 bytes
SHA-256: c0a378b5b91db5c8a678369bd9b369da2c89f07a9d2aac3ebd2cf689fe0dd2be
font_01_sfnt_off000108df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DF 11080 bytes
SHA-256: 67388d87112650406640c72e501c6d1f6be42fc28b96638184ffddf31d56b85d
font_02_sfnt_off000122c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1