Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce2062d6879adc59…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 06:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1c0c1c31402c5449dd64e9d1b3eb1fb1 SHA-1: 2645959070e90933985cc0f8f8313fabcf3d8d42 SHA-256: ce2062d6879adc59f999daebb6abe4776a52f463340ca716b4d7c32921cd843c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing for PDF_SEO_DISPOSABLE_LINK_FARM indicates it is part of a link farm. The sample directs users to a collection of other PDF files hosted on various domains, suggesting a campaign to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://lonerangerfanclub.com/ckfinder/userfiles/files/96587664634.pdf In PDF document text
    • http://dentalweek.eu/userfiles/files/65263395628.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/83552094184.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/19598675988.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/12062804528.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/sapukawamuzijeremoka.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/44579635702.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/88783815562.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d81c268e87---fobimozomedetewozowov.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/72659097397.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/ledusuxuv.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/74842727274.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/81451879060.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/51220228806.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8094b6d62---foxumevuxogaxizinilolo.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/52833850006.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202191356335430.pdfIn PDF document text
    • http://artospace.com/pics/file/madagijiropurexepapeva.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/bolirijimuver.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/girojexunefuwip.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/69955424867.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210912_170113.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/fasedesekuvixed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=socially+awkward+penguin+memePDF 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_off0000ddba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 11056 bytes
SHA-256: 04e90b41be44c42d00e3ff92aefe0d9cf8ad0a0b529a10ffa79beb0ec064ab97
font_02_sfnt_off00010f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F57 18252 bytes
SHA-256: a01e2c485f8b0078b9cc40ce5f5013092cbb7db81b56cae96a6e9b2112f3eaad

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