Malicious PDF — malware analysis report

Static analysis result for SHA-256 44fb90d98645313e…

MALICIOUS

PDF

83.5 KB Created: 2021-09-09 06:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ce2e0fd26d87161a73e6e7fd845070cb SHA-1: da1594e5e806d7a91a0062e98ca568b420039480 SHA-256: 44fb90d98645313eaca8a350c021a3fb6a7d0d7cbf9279a5157c7536090de43f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains JavaScript actions and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It embeds a large number of URLs, many of which point to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of JavaScript indicates potential for further malicious actions, such as exploiting vulnerabilities or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://ketchas.ru/uplcv?utm_term=chemistry+practical+class+12+functional+group PDF link annotation
    • https://retake.dk/ckfinder/userfiles/files/jokuzinimokubokijilazobon.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/12322583504.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210903091212.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/nedifojesobofenenuninuja.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/sizufupa.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3339d68550949408b38d31b3dfe55697/dinabok.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/lodagaf.pdfIn PDF document text
    • http://charivne.info/images/file/jetuvonuxinewedojofugo.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/lujojusexux.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/vuzofunisipigigatafoduw.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/60026977123.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d3016dfaa---79838200613.pdfIn PDF document text
    • http://fructusartis.com/i/File/76624515740.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/rojimogiruvevozebama.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/lopawabulegapolom.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/26730217182.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/miwoxodilab.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-8/20210908063257285419.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/zugibojalike.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/70601890510.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/xowalixopevekilusel.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/39371833591.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/ruvaj.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/kirebinimaziv.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_off0000e0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 17328 bytes
SHA-256: 6bde4b2cddc02568caa682d3e0e90d33899568f392cced95d6422dbaba01f6ad
font_01_sfnt_off00010d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12553 11344 bytes
SHA-256: a0a47945bfd428bbc1ea5dd41eb5e8934469d1908341ae6629d931ffd426ffb9