Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3392db6669b828…

MALICIOUS

PDF

76.0 KB Created: 2021-09-09 19:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e8874993f33c35e2e3eaf97ac061409 SHA-1: ea64fe3d352fbf3164555d3f3852cf16e0183723 SHA-256: 0c3392db6669b8282b2a94c2cc9c2abf790962172badb4bac96f2a7a02a3f10b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to a link farm, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the numerous extracted URLs. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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://honmamon-s.com/img_seminar/userfiles/file/wimufatuwa.pdf In PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/zegiba.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/22405647054.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/zikovojokafop.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/gepar.pdfIn PDF document text
    • http://bienbao.net/uploads/files/tiruwota.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/68524078170.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/14785829995.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/woveneluzikosixusew.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/39765498056.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/tqt7psfvum2ouv2ji76284lbr4/72371151219.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/81439437123.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16133293e822b3---81476029854.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/tizejimugalelinosux.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/4608708630.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/35067485919.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/silavadozefasisasa.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/kesepi.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/21253899857.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/74840268454.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/ziduromipanivefeduzufuwev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=super+loud+volume+booster+high+sound+booster+apkPDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/goletaxujisiwerix.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/taxukidup.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD691 19044 bytes
SHA-256: 1f0d219ef39f1a343704dbe7600d8874e9174977b200e8b58e7dde1439a892ff
font_02_sfnt_off000107d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D4 11312 bytes
SHA-256: 3b0f68a51a40a88f2402a8a8da969288d764e0aec00e0aff54801b3655f223cf

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