Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29d1faad0e9d79a…

MALICIOUS

PDF

78.8 KB Created: 2021-10-10 20:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1a14948465a61f633e965dce84348c33 SHA-1: d2def53810fc6729bccca550c8318f4c5c80fc1e SHA-256: f29d1faad0e9d79a90ae492608c47fa640a825dd6efc8e465af64167bc691302
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://archism.ru/uplcv?utm_term=at+low+level PDF link annotation
    • https://fullhousetourism.com/UploadFiles/file/20210909232610106.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/58514193411.pdfIn PDF document text
    • http://agmapure.com/upload/files/godiredazofopemilolizod.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/bofuxomaja.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/jetepojatojuto.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415e436fc81---65732921272.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/daloxefeximawuku.pdfIn PDF document text
    • https://esvigo.com/upload/files/54962464187.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/ridivutojuwalegijamis.pdfIn PDF document text
    • http://jpiano.net/userData/ebizro_board/file/48930976620.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/63376138203.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20211003165350.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/rutezumasiririxiwita.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/56395650332.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jijeresirobazisin.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/wemusifusagetimemaz.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/79441982906.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/851c65f1ed2d01e4ad1884af6351514d/goruvubiwo.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/84348026990.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/mifor.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/zivewizivukude.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_off0000d51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51A 17012 bytes
SHA-256: 82d0d53993bb6de752a491d0ae1687933966bece3d9a3babd9b4be0c7a31952c
font_01_sfnt_off000100e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F6 9608 bytes
SHA-256: 4074b04f88873356eb345a1bd9dd015a9269128b5ed4b6548e828a58aae47f64

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