Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1340f2d396bcd3…

MALICIOUS

PDF

79.2 KB Created: 2021-09-22 10:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 521fa93fa2670814a13fc306153794f1 SHA-1: 2939074f0edc1ad26912c278ad26d93e777a00ef SHA-256: 9c1340f2d396bcd3c1d70d154cbcf30a3e93621c610ae29aa0d2ebc856954591
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains or IP addresses, characteristic of phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134f90fc2e4e---xebipunafilenoxowad.pdf
    • http://falerisztika.hu/tmp/30646990415.pdf
    • http://tunesistudio.eu/userfiles/files/wivovimevirumajix.pdf
    • https://hattshopping.com/admin/assets/images/ckfiles/92617815548.pdf
    • http://mcutech.net/upload/2021/09/file/16318042941952853296.pdf
    • http://iamsong.vn/uploads/files/zepofib.pdf
    • http://nissanotogovap.vn/uploads/images/files/tapipofajopimomer.pdf
    • https://digireg.dk/upload/tiwuwofexatuf.pdf
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/6715627769.pdf
    • http://keralatravelpath.com/uploads/file/46207039572.pdf
    • http://nzozkrowodrza.pl/uploads/editor/file/gemaris.pdf
    • http://elisa5888.com/shopadmin/upload/files/tagivefudaraze.pdf
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/25711855718.pdf
    • https://rezilta.com/psum/admin/userfiles/file/vujemipigovoza.pdf
    • http://jdjcnc.com/upfolder/e/files/20210922154518.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f14245d1d0e783052cde2f1f11c0c9c5/17365858489.pdf
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/88891372906.pdf
    • http://hoteldanang.vn/uploads/images/files/rogixifuje.pdf
    • https://atamergranit.com/userfiles/file/53271921172.pdf
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/lapifoserarotagusikavor.pdf
    • https://ratosatu.com/contents/files/mulamanovisetanudagusero.pdf
    • http://140.121.161.111/ckfinder/userfiles/files/bizokesefipubasofibanux.pdf
    • http://tupnate.com/ckfinder/userfiles/files/27428968528.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=shortcut+for+switching+tabs+in+chrome
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d099.bin
1cf0e92923cac31c07e4aec657d0795047c483d1162b9e7a6d2555a974fbeb45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD099 11136 bytes
font_01_sfnt_off0000ea84.bin
45dbd34d46f6d022494165cc31249ab2456433708dbb79111ce7233fc7fe8c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 17420 bytes
font_02_sfnt_off0001177f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1177F 16792 bytes

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