Malicious PDF — malware analysis report

Static analysis result for SHA-256 9184731ecd7a2753…

MALICIOUS

PDF

81.2 KB Created: 2021-09-10 02:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8826a06244695b027c1204463c6a2e1c SHA-1: 0ca3c5cf5c1d88590e442953205587ce2c5d3559 SHA-256: 9184731ecd7a275344cee8c4a2a9e02aa075f7edb25d09e880a4be7351a63761
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content, possibly for SEO abuse or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • 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.
  • 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://dnm.tw/uploads/files/202109060001536365.pdf In PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/18623418831.pdfIn PDF document text
    • http://immopolignano.lu/images/nidaramomofedef.pdfIn PDF document text
    • https://j26clean.com/upload/files/givep.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396b44b1676---26991226825.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/xebola.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/pazasiwodusagozimejoxejo.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/86082338425.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/26386523281.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/ed93953919325e8e22502716d12548df/niputojerevujazometovu.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/44975010481.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/damitom.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/mamogiteji.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/38354433258.pdfIn PDF document text
    • http://synphabase.ch/upload/file/8374826407.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/14722740450.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/tuxenarupi.pdfIn PDF document text
    • http://sentai.cc/data/file/20210905_100945_248.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/95677671609.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/32237401362.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/nezepadovupunepo.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/gedukitoxuvujamawugurokox.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/53255026763.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/pubetejobabobu.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/xageganefuxuguwesozikuzek.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/sisikeguriga.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/lezovunixasivar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pack+de+juegos+para+emulador+ppsspp+androidPDF 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_off0000d5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBC 18404 bytes
SHA-256: b09e248a67aa5f60ba118a8bc95fca4b6d3c642814f77a45effc6764c39c2c24
font_02_sfnt_off00011cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFB 11080 bytes
SHA-256: 614d2af038522f1f081150b882dd681f01daf77c466603c344998fb289762592