Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f0e9adb4e61277…

MALICIOUS

PDF

68.1 KB Created: 2021-10-02 19:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2945fe90d7d32bc4681aab03423f34ca SHA-1: 685ade7692e498ce4f48a9c86544f283b7a9cc13 SHA-256: d8f0e9adb4e612771d2532264b0fbacb1c45da79b49fdb95a5d5d3fb643fc3b6
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 external URLs, as indicated by the PDF_URI and EMBEDDED_URL heuristics. The presence of numerous unknown URLs, many hosted on disposable domains, suggests a link farm designed to distribute further malicious content or phish for credentials. ClamAV and ML classifiers also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://biosafety.biz/ckfinder/userfiles/files/bozuji.pdf In PDF document text
    • https://funbugs.ie/userfiles/file/sapiwuru.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/21884444551.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/98762436.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/51749427753.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/nubexemiramajiduvukule.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/14181529838.pdfIn PDF document text
    • http://momsystem.ru/public/file/17840629639.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/2fe971f46aa0738be33a2c93650e91bd/25786837757.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/52700806259.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/99803501043.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/85915726093.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/1054681177.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/xerofazovo.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/zifomesopuliwimenefisu.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///jexewegekuweteraw.pdfIn PDF document text
    • http://techbis.pl/files/file/guzolixalutedusa.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/gitawirazi.pdfIn PDF document text
    • http://boden.boj.se/uploads/userfiles/files/zoweg.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-4/20210904200430599142.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/30383721489.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/63266362187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=me+and+the+key+2+level+14PDF 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_off0000abae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C0 15112 bytes
SHA-256: c19ef91d8cea7ac9cfab8049bfb32cefab3520e41fe99b1caa568bb601d7226c
font_02_sfnt_off0000ea14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 10380 bytes
SHA-256: 6e05cfc292c2bac0f4d457c6c3123ab482b5e11b99718e8ae8db741c6fa91c01

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