Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f0c65a807a9ce5…

MALICIOUS

PDF

96.1 KB Created: 2021-09-13 12:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fc9b3cc31c689986e1a43a8e2166854c SHA-1: d09939675d7ee78b49426ef9e24d2e1800a36666 SHA-256: e4f0c65a807a9ce55795bc2d4c0dadf5abb8862ca7e640822c43a17ebe35a595
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and external URI references, with a high ML classifier score and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm, likely to distribute further malicious content or phish for credentials. The embedded JavaScript is likely used to facilitate the redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://fitsiluet.cz/data/file/vavemepeje.pdf In PDF document text
    • https://gjbuyerbroker.com/userfiles/file/vuwogegabez.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/laloguxozarabuxanago.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/jituxujijakukojadenulij.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/35327983794.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/buwidunirurigiri.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/jawixavagafar.pdfIn PDF document text
    • http://machulski.com/public/file/61292013444.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/36641016677.pdfIn PDF document text
    • http://innersolutions-uk.com/file/jidamaga.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/satilatufumax.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/debezuvesonix.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/80409574093.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vivupojunanuwejif.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/45574971265.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/rifozax.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/pevevaromomezesusitug.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/53616804856.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/55679348494.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/sikasujodajidebur.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/saxigew.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/71550908808.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/96025091151.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/8632748490.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/tetatimugifolakuvuzuzodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=preobrazaj+kafka+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_off00010c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C91 10408 bytes
SHA-256: 521106525588abd80f685bb50a71ec264c4047df6a5413bbebf829d7195d7fb4
font_01_sfnt_off00012418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12418 20560 bytes
SHA-256: 17f35c68378639cf527c9926e497e8a1d4f5ee988e4909580e3d30cd8a9f1eb7
font_02_sfnt_off00015907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1