Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0ee49dd9724f83…

MALICIOUS

PDF

72.3 KB Created: 2021-09-17 23:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0b031ff3814aef67fc46c2cf5c3ac50e SHA-1: bf34af73151c2db3d32940c3b393a692dae8e1d5 SHA-256: 5b0ee49dd9724f83f61152f87932557e9ef6c12feaacfcbd49c07986f65c0cbe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=how+to+update+a+textview+of+an+activity+from+another+class PDF link annotation
    • http://haki.vn/uploads/files/julegidomalexida.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/68518240320.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161379595c4083---zemisegobedoleko.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/65926785260.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/tazojonanojoda.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/kupabawuz.pdfIn PDF document text
    • http://santehnika34.ru/images/file/46957065557.pdfIn PDF document text
    • https://ka-base.no/images_content/file/18233226261.pdfIn PDF document text
    • http://snft.ro/media/file/53376608201.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/59719202012.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/5468860762.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16311877513476.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/36595451289.pdfIn PDF document text
    • http://erex.hu/upload/file/demelomomuvijojukela.pdfIn PDF document text
    • http://aquatherm-graz.at/files/90263946365.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/mafotuzuxoniwufivobiwipep.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/nidipen.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/wezubinekikesovibazesofen.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/89034861553.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/kinufotifatupipu.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/fiwipetafedawoxusulux.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/93801615716.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_off0000b7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C4 11344 bytes
SHA-256: 05e6d81eba6be1f6ddfaa48823947186e0f204e1ab49119c2aebbea826983c50
font_01_sfnt_off0000d254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA66 15904 bytes
SHA-256: 899580c70fda6fde7f23724328bfe36b81e615c092e4727e4c586774803d5a05

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