Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ea9eba3271efe3…

MALICIOUS

PDF

84.7 KB Created: 2021-09-17 22:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d523b1dbb8596e585b4cc3bf438305c0 SHA-1: 1363645005980822ea51a3e1a8017cb271733319 SHA-256: 10ea9eba3271efe3c51d62a978a46592b4a4f00bf81cd0f950c8a17c0c1027ce
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to external PDF files, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a pattern of using disposable hosting for links. The presence of a 'Download Now' lure also points towards a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.larucheapain.fr/ljk/file/294173294.pdf
    • https://arerp.kr/data/file///dawaxuduxezojigawabap.pdf
    • https://ewastexperts.com/userfiles/files/nozolasolevifobarejade.pdf
    • http://eia-edu.com/userfiles/file/46308212492.pdf
    • http://kopdesign.nl/userfiles/file/jasuvosuteros.pdf
    • http://giovanniseneca.eu/userfiles/files/xatofesesokagamuvikizu.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee36821b69---dasebawilijun.pdf
    • http://pieseclimaauto.com/files/file/sowinu.pdf
    • http://hfnhsw.com/upload/files/47907962059.pdf
    • http://traktorpulling.de/ablage/userfiles/files/juxunawenifetogatofa.pdf
    • https://akanaymatbaa.com/calisma2/files/uploads/neduxutugazunifunez.pdf
    • http://fosterfreezesantarosa.com/uploads/files/dubidujanamumirixewu.pdf
    • http://star-transform-moscow.ru/uimg/files/wogosumagetigaja.pdf
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xidarakabuzosos.pdf
    • http://zeroseistudio.eu/userfiles/files/wiluki.pdf
    • http://nocleginaplus.pl/uploads/userfiles/files/vakawawigom.pdf
    • http://mannaz.pl/userfiles1/file/gexidiwupobivojediserux.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e37f44c3de---82883228080.pdf
    • http://ganteltechnology.com/system/userfiles/file/zukibafanumadijaj.pdf
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/41474270296.pdf
    • https://abisspaandboutique.com/nbloom/fckuploads/file/76177620356.pdf
    • https://vientangluc.com/upload/files/90420877606.pdf
    • http://373113.linker.tw/files/rugevef.pdf
    • https://loyalangkorapartment.com/userfiles/file/85234878951.pdf
    • https://parfumzone.ro/files/file/muxolin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=baseball+nine+mod+apk
    • 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_off0000e54b.bin
9c98064916af9c1ded5a0cb2b7195054550fa7c6b68e78876e55599cfe432053		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE54B 18464 bytes
font_01_sfnt_off0001155f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1155F 16792 bytes
font_02_sfnt_off00012d76.bin
889e5207ce6228b69cbed47c27649ff1baf3bd1c8bd4a6d4f245f2c26db45e59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D76 10640 bytes

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