Malicious PDF — malware analysis report

Static analysis result for SHA-256 429ea70e31695bb5…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 16:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4f606efd5c9baa296d5e9f90e3e8cd6e SHA-1: 70e13a4dec6d403a8c5caa9ff7ffa3f5a82e3811 SHA-256: 429ea70e31695bb54843f4522212a362e4b784c4549ab42a0f85617b7570bb78
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs pointing to disposable domains, flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is the primary mechanism for executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://polyacer-ecp.com/userfiles/files/20210907_214500.pdf In PDF document text
    • http://dispensapertutti.com/userfiles/files/18180497273.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141f2134ff06---tafedokatarosatuwiladaker.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/tiled.pdfIn PDF document text
    • http://clingac.com/d/files/saxomonibepibiza.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/10579346044.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/26855349994.pdfIn PDF document text
    • http://carbonelite.ru/file/71389223109.pdfIn PDF document text
    • http://ilkemymm.com/image/files/64651412562.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/zepebenisima.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210908045714.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/jerobuvu.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/21955182038.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/89577425796.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/71893995609.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161336810d6275---dewopimexasexetabi.pdfIn PDF document text
    • http://koddous.com/userfiles/file/wukomanekikigosubave.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/mopomovo.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/zexijefaginifijowe.pdfIn PDF document text
    • https://everestart.com/images/stories/file/52945961505.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/tadajekipugevo.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/rumabuve.pdfIn PDF document text
    • http://na3.it/misc/file/93549942505.pdfIn PDF document text
    • https://maymac.info/userfiles/file/sewomuzimusisuribonaji.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/fuvufumanozenebarera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=can+you+call+a+number+you+blocked+androidPDF 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_off0000da34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 10740 bytes
SHA-256: db59ae38540c598cb7b7a41d84be8304bb399a037866b239b18e3205d0ab8cbd
font_01_sfnt_off0000f2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D3 18028 bytes
SHA-256: c3cf66cf4c87776b512afa36b60f2f88c8ef8b14eb60ee1e6b61205cda8ef768
font_02_sfnt_off0001217e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1