Malicious PDF — malware analysis report

Static analysis result for SHA-256 d095c685be406aff…

MALICIOUS

PDF

77.2 KB Created: 2021-09-16 16:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 899311661499e5c337b84ea37fae29f8 SHA-1: d0c3a2195ded1132bf318a5f65aaa5f7323ae65a SHA-256: d095c685be406aff14818498e234c805f716e5525950a1868c7c804205db7221
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://coretry.ru/uplcv?utm_term=super+mario+3d+apk+download PDF link annotation
    • https://triatlonshop.cz/userfiles/file/wunatoginu.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56355171448.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/62181874581.pdfIn PDF document text
    • https://projetovm.com/uploads/files/38024462324.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/4280111454.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/43734072229.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/kajigibu.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/26183532760.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/48442374729.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/15523710329.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/96044417724.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/34701667415.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1811638a3---14339780928.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/35949503500.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/90689568696.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/jalabujezatamopot.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/52950403072.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/82391004694.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/tapop.pdfIn PDF document text
    • http://generoussecurity.com/uploads/56438086294.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/lafosiwubokededejiwefi.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/silurime.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/rulenifeluwo.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/jizupe.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/sezutimimifodudo.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_off0000c2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB2 19936 bytes
SHA-256: 15c7e0c49305642dfe601825e2c42d880b1273b3a0c73e85fdf88dfa3665e887
font_02_sfnt_off00010e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E72 10812 bytes
SHA-256: 63d5d616fe457787d98fe8c369d31fdbf5b4a191d47fc0a43661d770cc0a98f7

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