Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd931e66045c0716…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 12:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5dacea1fc0c046495f1b1e4aba502122 SHA-1: edeec725941537a35ac9322a38fb3debdea9513c SHA-256: cd931e66045c0716e55ca042ce6e6f0aea1c2c81fe891964756454fd2eed0911
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. The PDF structure and embedded URIs suggest an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=miui+12+redmi+9+download PDF link annotation
    • http://oishisushigd.com/uploads/files/95895459770.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/juvafekedetudanabu.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/nekosowudagaboxefub.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/tabikutotijireroxude.pdfIn PDF document text
    • http://vanhacollection.com/images/files/raduvekosasukerevas.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/paxowepozavibejuzamoso.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/kubul.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/57854525021.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/63070376108.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/jibumobefe.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/40873570298.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613054c201969---pubirogisiwuzopuvepim.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suloratodedodijifekodaxa.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109241158583139.pdfIn PDF document text
    • https://ratoempat.com/contents/files/milatamigiwogakaziro.pdfIn PDF document text
    • http://calisnt.com/uploads/files/91580135403.pdfIn PDF document text
    • https://showerdrainplus.com/uploads/files/202109230245163467.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/kafabasatebuluderowir.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/zubuf.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/pujokerikaritax.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/dusikesanevab.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/fefefevavetanitugana.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/bepufowadopakavo.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_off0000b26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26A 14984 bytes
SHA-256: 8947573692e6887e4783770ff1ed4309537432666e952fc7e646b0064edbb367
font_01_sfnt_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 10660 bytes
SHA-256: 3faad237e2afdc6694e3f7788a9fd634fdce61d6bd58317edd3f977ad35416ec

Open this report in the interactive analyzer, or submit your own file for analysis.