Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce47c1284bc4f2c8…

MALICIOUS

PDF

77.1 KB Created: 2021-09-08 22:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e11726f826bb514bce0e8d8fb0363950 SHA-1: 1b2f148bb6d56a87470199bd7b295e9d0d5b2f7b SHA-256: ce47c1284bc4f2c8253d5499cd8d01a1c2217ecec8a5ccdb59186d55c6772c6d
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, many of which point to disposable domains and are structured as link farms, suggesting an attempt to distribute malware or conduct phishing. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate effort to create a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://tdfstore.it/file/lanidifefimurokev.pdf In PDF document text
    • http://dcbestwings.com/uploads/files/71376201318.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/retunerete.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/7434240198.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/mipiguvokipusiwowirowore.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/rotorovizezawetevud.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/40247266739.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/mifop.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/64319298331.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ac04e7ef2---lejomu.pdfIn PDF document text
    • http://boldogelet.hu/media/96452092202.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/nakinasexewizamowunopel.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/47733109842.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/29052244554.pdfIn PDF document text
    • http://annabarons.com/files/files/tubagiteloxixikamegu.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/48483620111.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/97657633475.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/76dc40b74d6be2e66f8ee0df3a65c8bb/kusol.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/44134743710.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/75104318284.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/gimopuri.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/97414039486.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/45892264338.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/76628506807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=grand+truck+simulator+hack+apk+downloadPDF link annotation
    • 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_off0000cb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4A 16588 bytes
SHA-256: 04ccfb719a205b8eacb180437bd3cdc7bff5da5caf43df9d2f9838b2e3eae697
font_01_sfnt_off0000f5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 10964 bytes
SHA-256: 1522027a88d8690f08be1d54c7f10fc1e40900ad1918166012a624ba70296b49
font_02_sfnt_off00010ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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