Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d14343e94a6827…

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 18:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 41a3879b0bc3ecbdbd63b39a914f0bf5 SHA-1: 43d98e426dc243dc34ecbc6132169a17bb1c33fc SHA-256: 22d14343e94a68271c48f2cebf4d8d8527d6a21cb1b4fd9735583a058ffcb4da
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a heuristic firing for a browser extension installation lure, indicating a social engineering attempt to trick the user into executing malicious code. The presence of numerous external URIs, many pointing to potentially disposable hosting, further supports a phishing or malware distribution scheme. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://venkateshservices.com/uploads/lenur.pdf In PDF document text
    • http://tryinvest.eu/userfiles/files/tawan.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/bebovinij.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/71370350639.pdfIn PDF document text
    • https://bawauang.com/contents/files/winemoxiridopagim.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/nawamukixolafa.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/1005348974.pdfIn PDF document text
    • http://lg-palette.com/upload/files/12111002040.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/34645050268.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/ruvatutij.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630677491.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/50930994063.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/kesotagow.pdfIn PDF document text
    • https://cooperspick.com/files/27195831296.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/62060173317.pdfIn PDF document text
    • http://www.heksan.com.pl/file/6057471205.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/guxetub.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/loxojaruxokifiso.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b62e16a1b---logekijigorivimuluj.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/zugatofaxe.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/88rcasgq4e31fl33l07rttgoo0/xigezubafisi.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/87938772610.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/39212080102.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/fuvefutakir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+chrome+refresh+pagePDF 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_off0000d5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 17184 bytes
SHA-256: d690ad55416758f6acabc167891e85766ec464e06a0dc614952cde7b577008ff
font_02_sfnt_off00011a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A54 10904 bytes
SHA-256: 9fe92589c830e0cef2d60a6712b031044fc9add92ca220466f4d267d13c7b432