Malicious PDF — malware analysis report

Static analysis result for SHA-256 221a5bd4186d4e7f…

MALICIOUS

PDF

86.2 KB Created: 2021-09-17 20:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9ef1d19d5481d579bf1b96091b3bf39d SHA-1: 3c0f673fda8117dc4d78a18198bf6c46cc60df9e SHA-256: 221a5bd4186d4e7f10b7269e0bdfffc4dff67538f8ad8da899cbc507618589a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable hosting and function as a link farm, likely to distribute further malicious content or conduct phishing. The presence of external URIs and the link farm heuristic strongly suggest a malicious intent to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://infrive.ru/uplcv?utm_term=emoji+app+for+android PDF link annotation
    • http://sure2trips.com/bot/ckfinder/uf/files/jifawut.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6ad61b8fd---jolavidasepoj.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/95813946831.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/vukakogetidax.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/54081024640.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/58q60suhseg5cc1du3d0197k1g/35026316625.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/82476189324.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/boveropawe.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/7660257426.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/76496860918.pdfIn PDF document text
    • http://chongros.com/userData/board/file/zuzapukosujomizajozo.pdfIn PDF document text
    • https://megashina24.ru/files/files/42763421900.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/81761649631.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/kisimiladuxade.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/muvile.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/toribamumek.pdfIn PDF document text
    • https://samudra99.com/contents/files/6906975802.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/junukubajupamo.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/segoxuxonegabegelatepixet.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/selogonuwunejibaluliluwep.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/30753261999.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/wolixobej.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/jemalesogixazobusuz.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/nakoti.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_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 10328 bytes
SHA-256: d1ade1ba26dd806d39cf1cd1f378a20f00f7c861adbf4131856a99d0316e7c04
font_01_sfnt_off0001046c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7E 18092 bytes
SHA-256: 746a067922d5004d7644b59306a6b5032e74406254e9f497a9c471d41a6229b6

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