Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e33b38314bd730…

MALICIOUS

PDF

83.2 KB Created: 2021-09-24 09:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 799ec5c2e1ee1abd4d66676a50564b58 SHA-1: b8f68309664af4d7f267b3768abb23870aec9523 SHA-256: d3e33b38314bd730deaad858eda6f96d85b219b99bde731532dd67c5c83d5cab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://billedbutikken.dk/articlefiles/file/6872652696.pdf In PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/89634845850.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/26081793593.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/85575277056.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/xizux.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210924005108_mh3jkk.pdfIn PDF document text
    • https://windscrm.net/files/file/58748305036.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/42669123470.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/zixibu.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/27023472430.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/91761305712.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/21882178067.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///siwinixogowuta.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/bovegujodimikaxed.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091407280373499.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/kisawididimojixinedaxi.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/xevabutofazidigogokomote.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/wegupegosuwa.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/tituwixodizavapavub.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/gison.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/c3870f0592ba46e1cac0ee174fcdc7e7/39716751806.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/11455439001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=vishnu+sahasranama+in+kannada+pdf+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D2 19408 bytes
SHA-256: 887f8a94d52627ef846a5bc9f57e79c31d28fe41b62b1e40d62aa71579fe0736
font_01_sfnt_off00010482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 10912 bytes
SHA-256: afab77ad3bd98649e1f03e8972a62f34f371d5eb9b7c13aa08ea3adb6378712a
font_02_sfnt_off00011d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8C 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105
font_03_sfnt_off00012655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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