Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e6813656bcd9f5…

MALICIOUS

PDF

70.2 KB Created: 2021-09-13 12:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c80e31a70672d6a350b160ef61da33d1 SHA-1: 861064bc0f4aaf14a4a929e14674cc92f263b653 SHA-256: b7e6813656bcd9f5e202a2e37a4663802155b00c264b1e4f0003892fad326496
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, identified as a link farm, with a high ML classifier score and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags the sample as a link farm on disposable hosting, likely to obscure the true destination. While no scripts were explicitly extracted, the nature of the link farm suggests a phishing or malware distribution attempt.

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 http://festacreativita.org/userfiles/file/fadadezajiguxigorifije.pdf
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/wawepemajalom.pdf
    • http://medica-eg.com/userfiles/file/xavipowafuz.pdf
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/65197013193.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/58e9359e692207a13a6a9621276aa881/62719005166.pdf
    • http://ciccioinpentola.com/userfiles/files/zisosuvosatuzafusixoz.pdf
    • http://garankuccu.com/upload/fckimagesfile/a55ad9e6af2e83b712c0ad28a414dccf.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/59653826264.pdf
    • https://boumqueur-edition.com/upload/fckeditor/file/doxuruvokituriwadepu.pdf
    • https://lapakunited.com/contents/files/tezoxipubufiro.pdf
    • https://sinarlangit1.com/contents/files/gorajisexuz.pdf
    • http://vipnjl.com/userfiles/files/84969567142.pdf
    • https://ht-cooling-j3t.com/contents/files/xamerigepijukovudiz.pdf
    • http://mottaing.eu/userfiles/files/lidakadoxomudufabugigef.pdf
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/nonifojobejowetazemuro.pdf
    • https://a-metal.e-giant.net/archive/file/files/68138813760.pdf
    • http://xn--9w3b11kh5l.com/ckupload/files/33699277205.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161367ea589531---varunetirobifepurizo.pdf
    • https://kenkochaya.com/user_data/ckfinder/files/fizojomepebamagiwoxenusis.pdf
    • https://clubkdo.fr/img/pics/files/kusizawu.pdf
    • http://thietbiytedaibao.com/media/files/beganepisuvukujuxosufuga.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=a+quiet+place+2+movie+tamil+dubbed
    • 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_off0000b105.bin
0ea88159a5280f540f982237892894af81337437043b4bbd93bf47fd409dcfee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB105 10856 bytes
font_01_sfnt_off0000c9c3.bin
f8b5992f21f349cb42a8ad19d5d8de48db3bc9659a4243cddac029ddc5d8500f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C3 16196 bytes
font_02_sfnt_off0000f396.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF396 16792 bytes

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