Malicious PDF — malware analysis report

Static analysis result for SHA-256 648211756e4099d9…

MALICIOUS

PDF

77.2 KB Created: 2021-09-14 21:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: beb25064fce8607390410683246a3377 SHA-1: 172310603e85978c1952ae52105eedd1a0bc9f59 SHA-256: 648211756e4099d994c5bd1a9dfc141ecd8fd8e65d0eec16dc7c70b60871ef55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on disposable domains, suggesting a link farm or SEO abuse tactic. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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://vertex-decor.com/userfiles/file/73204756526.pdf In PDF document text
    • http://bluebossa.pl/files/file/94840061845.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/45287336196.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/gixupotisoduxa.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/zedemexejukowu.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/2613321455.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/1712028332.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/lekurolawobisid.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/niberakopabiluwep.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b5eb6245a---senasemizigodasutoted.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/mixubinilizabeso.pdfIn PDF document text
    • http://julianina.dk/upload/file/40179192696.pdfIn PDF document text
    • https://educhina.mn/editor/files/71964083627.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/76695163357.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/82555292632.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/digotegowupowukul.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613c04d8d8467---rezosavoxiw.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/gebosabepefi.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/biwikejujisomoganosopa.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/fomogubolatufakutirurad.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-11/20210911101320648553.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/jebez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+turn+off+sync+contacts+on+androidPDF 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_off0000c88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88E 17840 bytes
SHA-256: 095daf0bb2eb783d9166cd9f145b0805b01f2a77338a0631f9dd738fee2aeac5
font_01_sfnt_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 10584 bytes
SHA-256: eb2041fb1da4ad5bf387ae03726d0fde09373f0968a7e3db014d85eea6618099
font_02_sfnt_off00010f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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