Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa3d754c0ce984c…

MALICIOUS

PDF

71.6 KB Created: 2021-09-11 17:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 63a37c85df85b1ee65bd67ee4900abab SHA-1: 4a78d36a746847cea2a6301769da94a349b7daf2 SHA-256: 6aa3d754c0ce984cceb960cdae33e5fca37d2d862e30822188ae7e031a72e5fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zge-led.com/luodan/images/userfiles/file/xuzuzutolepuzigeritax.pdf In PDF document text
    • http://korsorlampang.net/user_img/files/datakubizu.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/73855511562.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377ad994806---7871289218.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/dijepuxe.pdfIn PDF document text
    • https://parfumzone.ro/files/file/nilol.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/zazitebimapa.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/masisasirupefumumupo.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/9357850987.pdfIn PDF document text
    • https://ip-pharma.net/data/files/maravetavo.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/nejatipebute.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/5593475845.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/39802019790.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/tizulodexilof.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/64039868778.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-01-07-57-53-20.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/taveladopugawusopije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=y+se+aane+wale+wordPDF 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_off0000b180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB180 18340 bytes
SHA-256: 14d95c171eb08d1294ec7b3cd2532b7ac103c17bd6111107fc0878ea644171d6
font_01_sfnt_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 10120 bytes
SHA-256: 101321d4dd24f1aeff0cd3a05df774309e3c76ad03a96f31b4e1af99b2691716
font_02_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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