Malicious PDF — malware analysis report

Static analysis result for SHA-256 722ed8088a5d17e8…

MALICIOUS

PDF

81.5 KB Created: 2021-09-10 03:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 054dd6f0871bbe6d987e504b29492ae5 SHA-1: 2500559c079512510828cacb5bd2a4239fecd5c8 SHA-256: 722ed8088a5d17e85693ee1e2ec3843083a739e098bc422f3110cdf179773dd1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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://wastran.ru/uplcv?utm_term=open+kindle+email PDF link annotation
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/dubusugemafisapaw.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/vebowupeferugu.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/65585082333.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/fenipebigokugetonaf.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/66983388816.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/88553141110.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/70638857391.pdfIn PDF document text
    • http://detmers-kontejner.hr/files/62176988321.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109030451293501.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/movunefer.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/71551715592.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/45034756720.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/beganolasozalipitevasa.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/51295820790.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/24788325751.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/depusupegubari.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/momubedanoximumareguto.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/nuvemidat.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/nurajosowolomeriromazi.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/36906650432.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161316708342b3---11102665014.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130728595101---safifan.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_off0000dbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 17552 bytes
SHA-256: 7e40e42045d1aa8000c4d8ad48aa330aa5a08c7abe91386c45d8518af8661acd
font_02_sfnt_off000121c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C3 10184 bytes
SHA-256: a3c249be078f2c17c9f63c9698d345e3471470043b03e03f5411cb417d73d58c

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