Malicious PDF — malware analysis report

Static analysis result for SHA-256 3938f43575db63db…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 02:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5bdc9da34b40e137295e71d122a06f2c SHA-1: c54d55173d097f7fcce3965286e9e0c24d111170 SHA-256: 3938f43575db63dbd8a6e5583fd86985d61014a7ffdd3799e7c22d450f20ca27
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The PDF contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The presence of external URIs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=how+long+to+keep+frozen+chicken+breasts PDF link annotation
    • https://path.mn/userfiles/files/71227691399.pdfIn PDF document text
    • http://cecev.com/stockages/files/rurabudupisopakix.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/gatugivebidax.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/32981088976.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382d2686545---49503979258.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/luzinumaxa.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/75550819358.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210910010322277.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa8f1153ac---tawulasuboni.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/87890978880.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/53565498147.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/73046249777.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/zevuw.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/nujetuxonedewomebiwij.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/67844138084.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/jijilarikerokuviwowepubu.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/wujepu.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/lekakubedivezazumovore.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/86798658936.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/21445497426.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/11350365757.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/21211977184.pdfIn PDF document text
    • 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_off0000dc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC90 11128 bytes
SHA-256: 86a2c6a16767724acf92a97115cc6960b651b9a46cb20ada4c94e485006224a7
font_01_sfnt_off0000f65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E70 18716 bytes
SHA-256: 909da1553a17675696919158d7fc7348320cd92cdfc16386275fb3239f7ddbeb

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