Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c882f742f58c55…

MALICIOUS

PDF

80.4 KB Created: 2021-09-11 23:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f14c81022908cc2e7ee06b32f8436939 SHA-1: 6544b3986db9b8481e8cba9d01eee1ffa7f1ad7f SHA-256: 72c882f742f58c5589d1fe9d94d00ec1ba7a75188688b40df56be61540ca2c3c
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, and the PDF structure suggests it's part of a link farm designed to redirect users. No scripts were extracted, but the presence of external links is a strong indicator of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://parejalecaros.com/adjunto/upload/fck/files/milozilawofikobu.pdf In PDF document text
    • https://carolinevlieghe.fr/images/file/lewovoxesirixamowup.pdfIn PDF document text
    • https://nls.vn/upload/files/82964350892.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a1cb6053b---dewowuzapiwanubo.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/puwowizuruzojonegox.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/durunafi.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613626f5ee662---zoxufa.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/tulinefilupijipamamono.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/tuvirokogoxabemu.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/89620556891.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/64400941905.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/kuperagadufotuwojomusob.pdfIn PDF document text
    • http://pi-consulting.ch/download/tewixurulugifamojar.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/vofipodisekufige.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/2167451005.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/zogomozajigowadijipiniki.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/jibugonefapanusajogixub.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/46999707130.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/pozenanudedetixu.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/75087100224.pdfIn PDF document text
    • http://bastola.org/userfiles/file/41460857867.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/5178809763.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/23448089906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=moonshades+mod+apkPDF 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_off0000d50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50F 10404 bytes
SHA-256: 5d7dd951af75feaa6594fb2140f0658ae514e5687b614a921598be2be0f6fc0e
font_01_sfnt_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 18716 bytes
SHA-256: 92ca5ab72805ed25869b706d478f5fed3ce19e7e29f5fd4dc2ded4dd2a65844b
font_02_sfnt_off00011ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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