Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e4bd62bebd4449…

MALICIOUS

PDF

70.7 KB Created: 2021-10-02 09:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3311bd33e55b9e58089ea15122e26445 SHA-1: 06c61c6262be0cf7b2f4da923c3f830f20397972 SHA-256: a9e4bd62bebd4449584bd8f1040b802ed91b8a364c80aa32e5c082038b84b991
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://sunrui-ti.com/d/files/59778833129.pdf In PDF document text
    • http://win-sonic.com/ck_imgs/files/57623401435.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/julapifukuvafoxatixiwupid.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109252352223589.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/wozafisimubo.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/44101986248.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/61765900447.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/36056110585.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614c152edbc2b---mozerigemiwesonijojewaze.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/vegavijalugalijuvemagi.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/49995417606.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/kesigewedoburolipuxino.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/21980595903.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/9079120247.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/17509124592.pdfIn PDF document text
    • https://kapefashion.com/files/files/babiwapibamamevekaku.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/dikisazenubifaz.pdfIn PDF document text
    • https://renault-service.com/userfiles/2278823554.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/26552973734.pdfIn PDF document text
    • https://denis-lefebvre-services.com/fichiers/file/36062723830.pdfIn PDF document text
    • http://swhos.com/upload/files/bavasetuzalafejero.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/vanad.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/51394613464.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/lipofuj.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/8625654104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=12th+polity+old+book+in+tamilPDF 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_off0000b31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31C 16360 bytes
SHA-256: 056e20baff1258c448288646dd55dcf9efe92dbd81b744dd15f3b435bb97664c
font_01_sfnt_off0000dce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 10676 bytes
SHA-256: 1e30d178fea7f06ea36c56051ca229f7bcb9439b60f7253a10bec9d96e02cc8d