Malicious PDF — malware analysis report

Static analysis result for SHA-256 39282ed6b53c37b8…

MALICIOUS

PDF

86.0 KB Created: 2021-09-11 08:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64f8a3c3d2387e1efdfa97129c94f859 SHA-1: b1a851cc0ca8f01d1fe7708f8d13703166e7cf91 SHA-256: 39282ed6b53c37b88ac60ef28268f0f8ad5799ade0a2b7d635b81e35debb754c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding a large number of external URIs, many of which are hosted on disposable domains. The primary attack pattern involves directing users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://cructi.ru/uplcv?utm_term=android+head+unit+equalizer PDF link annotation
    • https://alirezamirmohammadi.com/images/upload/files/goxewaluxe.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/tusoronumipulamekafi.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/bemosafofabivi.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/kewesusojuwikekavelor.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/netukijekexizanapimeg.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/disakizofod.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/10536834853.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/6505731051.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/safajutoxiwunedimodasin.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/29442731593.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/zowezuwenajitokugaxijesa.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/73125614615.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/72631610864.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/87863153334.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/zipumikiwewo.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/puridux.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/vavomilov.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/83587133265.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/52959887704.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/luufrp9j9fl148t1vibg3qpm7n/penobukibozob.pdfIn PDF document text
    • http://cribpointonline.org/cribpointonline/userimages/file/narofomuze.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/47455276803.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_off0000e8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 10464 bytes
SHA-256: 0acaf81e7c193b9b33d0489eb3cc3fc6c261b76d4e89e8312f16119cdec5d306
font_02_sfnt_off00011889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11889 19120 bytes
SHA-256: 403e4b2b66b83ef8b3487eed68fe65db9cb294c2ec0c28b4413245b3f89546b1

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