Malicious PDF — malware analysis report

Static analysis result for SHA-256 0213bf9c2c1541d7…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 14:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1197fecab266247fb34c4b94c8314fea SHA-1: 94b3c0bafee1f6da70587a205cdcd3d42dec4fb8 SHA-256: 0213bf9c2c1541d7c89f5af802c6ea1464c2a0d08eecac9f0a38f0ceae09108a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis identified numerous external URIs and classified the PDF as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=how+to+install+android+apps+in+ubuntu+20.04 PDF link annotation
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454fe85e442---27096535818.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/73084604936.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/48985073953.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-18/20210918101014606942.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/josiniwumevabi.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/77238894207.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/bozepoxarimamulavesovipij.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/jebenefutisokunarodojub.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/fikajirunegudif.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/motabojikofek.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/98918742291.pdfIn PDF document text
    • https://ferropula.hr/files/rebawefip.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/josanozemamanazidaj.pdfIn PDF document text
    • https://hobbypet.cz/files/file/77152064587.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/ef9358784cebe5e4f9790e48c0af0b1f/66884005184.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/sidegobowadagadus.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/36227757762.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/gamivatomuzokovetodowede.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/lenineditalaniwega.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/vuwibebusenuxinewigibon.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/90428380791.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/57574220109.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/zalutifa.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/lukaloxebov.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_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 18488 bytes
SHA-256: 52a0344b99bac8a6f9c14ecc2cab7bdd4ab5ed362e7730e45816cf02a9fece09
font_01_sfnt_off00011582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D99 10956 bytes
SHA-256: 7a6c9769fd978759ff2e67adbd467a5ea81fbc4f9e3f21becb04bf672230be94