Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb09ce429aa1151…

MALICIOUS

PDF

98.3 KB Created: 2021-09-22 14:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15e77225e140c9076d2f4b7ac04d43cb SHA-1: 201f23c8600d531ba765f9df9384a57ad856af78 SHA-256: 4cb09ce429aa1151c86bb1214ed4b18be35ef81187b8ac300e5a742ebf52b479
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm intended for SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=my+hero+academia+2+heroes+movie PDF link annotation
    • http://iwort.de/userfiles/file/48245682222.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b12eb7eb3f---ranovimax.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/37282604487.pdfIn PDF document text
    • http://exosushi.com/uploads/files/folafofipiwunozeji.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/migabemijor.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/77643995687.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/wisupa.pdfIn PDF document text
    • http://tmtteks.com/files/dewarabora.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/1235007016.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/94463933769.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/wewozuxurepewisasejo.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/97547226436.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/teperipiwe.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210905_0DE98CA8D4B6578B.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/wifezim.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/gozijusuwamozegefazuxifu.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/14974692643.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/4071900519.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/28765205033.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b4ef6c7b1---58281891435.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/11519999438.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 10680 bytes
SHA-256: 95f134da64c38e626cd287c89ab30b6560a7e78c1567909ef9507225efd7573c
font_01_sfnt_off00011f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F02 1768 bytes
SHA-256: 64a2a1250ec3cc7caf49fa48aadcc463d0ab2e1ac01ff91d238ddb07c53a74f7
font_02_sfnt_off0001275c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275C 23156 bytes
SHA-256: 26124da5ff95ebe42990dbf3fcaa1c8fcb65d061a665674d397ec46d925c8fcb
font_03_sfnt_off00016332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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