Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a346bb1d16ffef…

MALICIOUS

PDF

76.0 KB Created: 2021-09-13 09:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8c99979ccf9f72e7339a0988cef41be SHA-1: c5134bff9783817805d1afc512621bea6c229e80 SHA-256: 42a346bb1d16ffef17141caf8966338df77f32d460df5a7d7755b3dc813934f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://funcarele.com/ckfinder/userfiles/files/sejudera.pdf
    • https://hyosung-gulf.com/uploads/file/4046564029.pdf
    • http://dochoiotovn.com/uploads/userfiles/file/nalukeravidodirowur.pdf
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/dubolizalurijubivimil.pdf
    • https://eguiders.com/uploads/nosidenepomimilip.pdf
    • http://gibisch.info/files/files/zozewubaviz.pdf
    • https://ofcourselc.com/admin/uploadsfile/64591664945.pdf
    • http://saluteebenesseresas.it/userfiles/files/35422451844.pdf
    • http://hkxhjfc.ltd/uploads/files/20210906203055.pdf
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/genoxegamo.pdf
    • https://h1t-urlaurora1-turbo.com/contents/files/mivafisanupozosexebo.pdf
    • https://hometeamcorp.com/images/usr/lijigewu.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161302a11ca9a5---ziralewaribu.pdf
    • http://zekidilektekstil.com/images_upload/files/70269329009.pdf
    • http://k12kos.com/ckfinder/userfiles/files/33787985190.pdf
    • https://chorland-dining.com/webroot/editor-uploads/files/31663077457.pdf
    • http://phuvuongcorp.com/luutru/files/74285057359.pdf
    • http://c2r-auto.com/uploadfiles/file/2021091221335573499.pdf
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210902082925.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/84260600671.pdf
    • http://knipia.com/userfiles/file/66656802240.pdf
    • http://tagsu.com/attachments/fckattachments/file/88815639760.pdf
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/vakutukizajilorovavu.pdf
    • https://raselapp.com/userfiles/file/24188246640.pdf
    • https://lenaoyunlar.com/calisma2/files/uploads/25351846750.pdf
    • http://ruben.pl/ckfinder/userfiles/files/81113811300.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd7525d4f9---42725067212.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=apk+mp3+song+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4e3.bin
c51b3104515477a260abf8c6fc929742b5916fa1dd04cad475e45704f9ef8413		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E3 17612 bytes
font_01_sfnt_off0000f226.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 16792 bytes
font_02_sfnt_off00010a3d.bin
86adca687951e41ace70acb8e74b72e027ea3c09fb50ba59cdf0f1ff371b1ef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3D 10644 bytes

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