Malicious PDF — malware analysis report

Static analysis result for SHA-256 6768908e187c5d2b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-14 05:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: abba39ef48d31812eabba56f2da9b5df SHA-1: 65cfad26676a4ab3064746a9b4079e160ea4bebe SHA-256: 6768908e187c5d2bcf1950b040824ced320a441b658c03f7cffee71e75bdf244
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to potentially disposable domains, suggests a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/fodetifiwubesowebix.pdf In PDF document text
    • http://guanzhuli.com/userfiles/file/ditifito.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/68671886322.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/tibegesuvuvoxazimigibax.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/26309517094.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/54961202203.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/sugel.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/ribejowinezipixepid.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/65883479895.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/pesozeboxujobajidaxu.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/lowesijezozijabobugotewoj.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/24291052810.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161363b260a00e---wepinugogunuz.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/nufipinapegatorale.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/72326916745.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/29994652980.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/5042780891.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/16972876051.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7aad67afd---98164773394.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/kerijixamonox.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/39920756989.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/xevonukesijadepanezuxe.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/talakotizupu.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/560911594.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/xekatewomenodukijewurezu.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/davogagusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=james+and+the+giant+peach+roald+dahl+pdfPDF 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_off0000e39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB2 11056 bytes
SHA-256: cb1d1992a64fa0851fec9f3af2a3bcb9ee68c34c59332dccee8b388773dcd31a
font_02_sfnt_off000114f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F3 18228 bytes
SHA-256: e99493a48447dc6080921310aba7c84e31a4b2cccddc7b089ca5b6ef6bb11614