Malicious PDF — malware analysis report

Static analysis result for SHA-256 363550b2a3a1005b…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 16:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 55000fbbdefbf9dbdfce484f18165ebf SHA-1: 71384eba15396552f36d8dc94c66692c5f21ba5a SHA-256: 363550b2a3a1005b709189dc002d129d4c288538e0eeca22e0c9b45176cb0ccd
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document contains numerous links to potentially disposable hosting, aiming to obscure the true malicious destination. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://galerie-louise.be/userfiles/files/87069214417.pdf In PDF document text
    • http://vantaidongsaigon.com/uploads/files/5726770097.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1390e817d59f638c29873ab2a4c839e8/zatifafajemokuvigakati.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/72787485766.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/zimefutigidox.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/70261368369.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/13582570363.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091204473074.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/fomadedozamekufebutasajob.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/jigamubokegebew.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/sulefolevepi.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/fetorej.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/banegaviwa.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/4421ae906037d1c7b3fd2d1020784aad/81729463392.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/48457160643.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/4362001456.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/derumodakopidabonudix.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/sarataralejiko.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/kibor.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/taxujogewapoxuvuje.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/nudibinegubelupaxagufuzim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=dls+19+unlimited+money+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_off0000da6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6B 10832 bytes
SHA-256: e2ce72c462456ed09023d19710e51edbb697cc0e19cc4f01452d91768df9a909
font_01_sfnt_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 16780 bytes
SHA-256: a86e91146678813f57049a32f75c8eee3c5145a795355b52e23a154b55045aa4
font_02_sfnt_off00011f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1