Malicious PDF — malware analysis report

Static analysis result for SHA-256 defe7c96c9520a51…

MALICIOUS

PDF

81.5 KB Created: 2021-10-08 02:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7327c4221e275a885f6eeb3db626d65e SHA-1: fc5478ef5c3f37e17627f8559c990d3e68d56567 SHA-256: defe7c96c9520a5139684a1d7e44f9ee219d72c2b957e26516286477ed5532f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms. The document body is heavily obfuscated, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hv2barrier.com/application/third_party/ckfinder/userfiles/files/18477933780.pdf In PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/39978910945.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/54906983603.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c442fc95b4---gilavin.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/12570408353.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/kimemivivul.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/lejumubijot.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/88505953120.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/pufodorujogukavoselete.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/7643552919.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/46708772393.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/78234054773.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/69316091734.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/70685179741.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109010727395900.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/fj6iljs6501ucrvo2jl3p9gah3/leludebepiwefikuxod.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/5004378916.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/fegenofatox.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/36045185724.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/joxobofunuwonesex.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/kodivo.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/49625847324.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/biruselusakutadifebizel.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/10087679426.pdfIn PDF document text
    • https://longhoang.vn/upload/files/804048844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+export+pdf+pages+separatelyPDF 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_off0000d8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 10768 bytes
SHA-256: 337bc5c16b71769c5c7ac1ed832f15a14491f8cb645d72a3ea03131d467a6c71
font_02_sfnt_off00010992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10992 17832 bytes
SHA-256: 0c34624b91650c0c2f13fe5b588159c18c73f812cb05a86045c0f4a8e221a9c3