Malicious PDF — malware analysis report

Static analysis result for SHA-256 b073dba6af2d8fab…

MALICIOUS

PDF

62.3 KB Created: 2021-09-27 20:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c5b9f395c93bbe7e4aac0e2ed120dd7 SHA-1: 37a9aa42488f046bcda21a73168a56afa84d3168 SHA-256: b073dba6af2d8fab31b13f47867e2c48fd8bfdff45614351672ded9049945aa3
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, such as phishing or malware distribution. No scripts were extracted, but the presence of many external URIs suggests the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4064

Heuristics 4

  • 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
  • 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://crysiq.ru/uplcv?utm_term=use+phone+as+router+for+pc PDF link annotation
    • https://irrisyst.eu/files/file/82233945210.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/pilujiduj.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/53510667720.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/69e9056964c38b4583eb503dc991d824/4558078061.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/kopadop.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/73878410716.pdfIn PDF document text
    • https://bunianco.com/other_files/File/mowokepalikevuxodo.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/xedemegafelefebuvo.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/zetosafo.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/67875474936.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/sobubopitowekegu.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/futabexowaweloka.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16147c22e0f789---batukuserakemikemuj.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/40217682765.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/wuzufetixexemaxi.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/62572208388.pdfIn PDF document text
    • http://ccsl.asia/files/vedotitegifitulojatef.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/sowufometebeli.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/12618850021.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/gexinutiwo.pdfIn PDF document text
    • https://accessnepal.org/userfiles/file/98632610443.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/72053280405.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/sovovexanov.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/87032325758.pdfIn PDF document text
    • http://irollee.com/userfiles/file/10070070938.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/75483846965.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/54404876365.pdfIn PDF document text
    • http://efckrakow.pl/userfiles/file/zadobetepopufu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB453 15672 bytes
SHA-256: 7c34caf410b7275f9d28ae14e98a160298a0685bd72bb31324662f756f5e7be3
font_01_sfnt_off0000dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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