Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b149724f32a569…

MALICIOUS

PDF

76.6 KB Created: 2021-09-15 18:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5bbbff0adb61d40e045b8f4ef382081c SHA-1: 909dd47e769a7c58aacc74918daac03369e6ff01 SHA-256: a9b149724f32a56956facdeeafba4d8b8ed2fa6f257abf46c4ecc40c44fe4ab6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document contains numerous links to potentially disposable hosting, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/k6ivcm5gfr55gs3qshnci59j6r/nenupemawiluzunuxenu.pdf In PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140693f03cce---lululefunupoguwepu.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/gimoduweruwesutiwede.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/58527955404.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/zupadoxef.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/39703882134.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/lutegegaxujejadum.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630958605.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/durisezufa.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/patepobiteximonawagojapas.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/75309572497.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/44112770773.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/vudilixat.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/natanewiruluwatopu.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/xobuxe.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/pugisufogokibapim.pdfIn PDF document text
    • https://airbays.com/userfiles/file/xavuvitutanidetifis.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/zumoxuwit.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/26534154060.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/39203879675.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/gixolaf.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/1431520761.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/33806948477.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/movujilif.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/tikixigolopir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=gta+san+andreas+for+android+highly+compressed+free+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_off0000c6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 11304 bytes
SHA-256: ffcd6a6f5d7b4f0c5e5d8ef5e383e01257f6fcdeed392cd0221aa2da9772c9bf
font_02_sfnt_off0000f94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94F 16540 bytes
SHA-256: 5d5219906e60ae14c605424ec212bbe35a9d9cb7e2687205d706b72d2bd73d61