Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23daf2e5da7ced8…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 18:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7c3910eed6de03284652a945c7f60a15 SHA-1: 6d01db3f0e6f523587adcdd2673b7b22d9ae9a9b SHA-256: a23daf2e5da7ced8081a95bcec4e4837828020042edc119da470b3d934c1ff8e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, including one pointing to a raw IP address, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm on disposable hosting, likely to distribute phishing content or malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=gta+san+andreas+6+star+police+cheat PDF link annotation
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161303de8ccddd---ramowun.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/zawuzozebami.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/ripezofimubejarotewogox.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/31476534139.pdfIn PDF document text
    • https://telorgabus.com/contents/files/64833893841.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/75537085175.pdfIn PDF document text
    • https://umartravel.com/files/71923171354.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/31939976183.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/fimizubul.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/nuvivuwun.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/zelotubabolulufogixer.pdfIn PDF document text
    • http://domuran.pl/files/file/ganit.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/21319954998.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/kexadavigip.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/gojulozigivi.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/betapitenolafuz.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/wewoxunuduviwot.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/raxuwesikil.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31195327371.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630798619.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b7345fd13747e95b7304f0664cf1d07f/wonopajik.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613851a090c02---99962377853.pdfPDF link annotation
    • https://seedomoretravel.com/files/files/lunesusozofiwajuperux.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/zenamijifowuvopolo.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/pinigoxupavapobisig.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/wemefoneroz.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_off0000e05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05E 10816 bytes
SHA-256: ddc85a7e04447a261631a8646c558c17c0e3ed94470c7f08b04e70d0b5b41f83
font_01_sfnt_off0000f93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 18344 bytes
SHA-256: f5e4aa1598f3872c5c187c2746a6a391821ca83081d6128cb596985295988e07
font_02_sfnt_off00012844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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