Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aad0227e9ca87fc…

MALICIOUS

PDF

72.2 KB Created: 2021-09-27 06:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 53809565afdfb0c0f84b5a2ed5e0ebc3 SHA-1: 514ddfa5da8f18568759108cea8f460dd514bbfd SHA-256: 8aad0227e9ca87fca21f5994a01f5fa9114f1c098a8b534e7c34f4766f1eb7b8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to a link farm, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this is a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://2015.letnifestiwal.pl/ckfinder/userfiles/files/jamifixepodilijazifafu.pdf In PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/70263118659.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210926020652.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613fe6029b04f---90560839174.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/tizatefipek.pdfIn PDF document text
    • http://tencanpowder.com/d/files/65467078307.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161436907da82d---30516651.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/65986947077.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/dedopesizogodiwubazigakim.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/27462334067.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/kodigurexerodo.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/jujukiritasukew.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/77957154877.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/sorezuvitezidurunosukeluz.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/torope.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/zisazoseduvabuw.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/vitajukaja.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/71969854327.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/11290150787.pdfIn PDF document text
    • http://tulga.ru/editor/files/jaroromi.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/fefomexu.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/60766293428.pdfIn PDF document text
    • https://alutat.com/data/file/nemubolaleka.pdfIn PDF document text
    • http://moneymaker-gold.de/files/15594134530.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/24755969492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=excel+functions+cheat+sheet+pdfPDF 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_off0000b50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50C 10804 bytes
SHA-256: 6a352939690cd493e39b5115ccad9dc3048ead01fce42c7d67648d178dff8906
font_01_sfnt_off0000cde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE3 17544 bytes
SHA-256: 08d9f37d0991db1c5e2e38b1aa7df8e45ece9c832c03eece0286976645743526
font_02_sfnt_off0000fab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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