Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e6b7ba933466fd…

MALICIOUS

PDF

86.6 KB Created: 2021-09-19 22:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 697a05e718ebf31435bcb1bb2ac4bc9f SHA-1: 71ab171a64008ac212c06e408dabcb5c55db72dc SHA-256: b8e6b7ba933466fd9a14141dea12afb6c795b065da1385eb6956cc417c9594c9
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. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs suggest a link farm designed to obscure the ultimate destination, likely a phishing site or malware download. ClamAV detection and the ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://heatingboiler.ca/fck_upload/file/60137150588.pdf In PDF document text
    • http://msslink.ru/userfiles/files/kivovutugofaxiwetuzoni.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/94591801981.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/36874703851.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/xovono.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/rexet.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/wetepelujolexaruguvo.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/62727649932.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/ramiso.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/9598306211.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/fexamojowuxajovegu.pdfIn PDF document text
    • http://wingtsunkungfu.ro/imagini_ws/gilejolasetelibefubudira.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/litemikakomiguvomirun.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/91447532878.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/tirajajopedubosemomogufo.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/55600476181.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/mafusekeb.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/nunebesoxewexasu.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136544d6c31a---kofaxizetomuzad.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/81376726656.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/80687410839.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021913950309296.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/rilasomovavagi.pdfIn PDF document text
    • https://iword.de/userfiles/file/69950351021.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/fokipupunaxojosub.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/33358876355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=american+phrases+and+idioms+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_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 17788 bytes
SHA-256: 504fcff50f68449bb6d29ac099edb7c45334b58a0ccf90e6f7bdbd3dcfe98c17
font_01_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001344a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344A 10724 bytes
SHA-256: b1e22247b5497c4ec9f3f8797bd7bf20a6d5823a690e6600a9a25190f0068711