Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d81dac2ddd754c8…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 02:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 940b255ba61e644093615d762e4fc4ff SHA-1: 869035a4d5b05d5cb32a9e96a7557845fadaf722 SHA-256: 2d81dac2ddd754c8a8c7b22eb27fbc4d28cf6d5085a21114abf9c882b4853506
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a high number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the attack pattern of tricking users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=new+tamil+movie+download+tamilrockers PDF link annotation
    • http://brickform.cz/obrazky/files/tukedokujinategav.pdfIn PDF document text
    • http://centronegozi.com/public/59664775002.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/60906007832.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/1cd83e34f3e268abb08315b2111ba86b/96583148753.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/sokute.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/sipinexupuwomuzonid.pdfIn PDF document text
    • https://bor-diing.com/upload/files/73101282050.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/21377136296.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/ludirujijuwijatizetu.pdfIn PDF document text
    • https://oferta.lt/i/File/12616749747.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/wurimid.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210909105545_ya3eez.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/vatibeguso.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/xafuwodasujowenelifadi.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/34796499921.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/lopusuxujawa.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/sazusamirirut.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614246af9c79b---14354274557.pdfIn PDF document text
    • http://csp.hu/editor_up/zilajasop.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/72025765669.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/jakenisisegariwewigodamig.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/savipugodopividarokubi.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/koximig.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_off0000e136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE136 17724 bytes
SHA-256: 344ccccc3db8162f3bdf5d1be5396d228ce44c20eb572a282e6f0b0968624924
font_01_sfnt_off00010ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA4 10752 bytes
SHA-256: 484ed212180554ca4a1f3e4e9b982b85914aca99818eaa90c2aab941a07e9fda
font_02_sfnt_off0001276a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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