Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2770bebe80039c…

MALICIOUS

PDF

70.2 KB Created: 2021-09-30 21:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e473284438fc4616a7fa695dd65dcd50 SHA-1: a2847fb87334375160605c9c221de3df8c8a9795 SHA-256: 6b2770bebe80039cd96673e53e484beae8cc3770fe7e03583f61bb31f79e445e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding a large number of URLs, many of which are likely intended for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://anandalaya.in/resources/file/68887155734.pdf In PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/detelegeluvax.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/sevunubetisinirezujisezas.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210912_5C8EFD52EDFE3597.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/28817836955.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/sizobitutefusofofix.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613f74034451d---kisegamanimibirusoduda.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/12948572002.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/kitukuverunosetamijebizar.pdfIn PDF document text
    • https://landi-bg.com/images/file/jewumimumalepuva.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/90362042420.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/71010108949.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/lolivenigituf.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109301922412098.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/13808892357.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/wedajulukinatales.pdfIn PDF document text
    • https://kildevangen.dk/files/8427395045.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210914014742.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/ruxelewixidosabivasusos.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jividunumoxaxew.pdfIn PDF document text
    • http://bancodevida.com/bancodevida/admin/images/image/file/jumazuju.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/29784384609.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/7456413640.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345f28f3b3b---molusudevatupusome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=athan+apk+downloadPDF 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_off0000b39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39E 15752 bytes
SHA-256: bcf62c3c2c101907cc56fd7ca802be7ae06c65765789e15e3b6a6d90f832a0be
font_01_sfnt_off0000dc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 10156 bytes
SHA-256: 303b68554a7d78d8c0712d30047f9034196438a6fb23d7e61f973cb6fedcdacd