Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1948f90cee740e…

MALICIOUS

PDF

78.7 KB Created: 2021-03-21 23:25:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9d9fbfdace9fcc0aaf37b176207388c SHA-1: dd9074ab9db609f70bae62701f16bcfd45a756bc SHA-256: 2c1948f90cee740ee771f4791d2d21701bb1e1de3a25284c0c2f7634ad10ecaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with one prominent link leading to 'https://kuzutuzo.ru/award?keyword=equivalent+fraction+anchor+chart+pdf', suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, and ClamAV detection confirms maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/award?keyword=equivalent+fraction+anchor+chart+pdf
    • http://joy-todays.online/nezobenareketizefofo5hxtv.pdf
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/355106c760.pdf
    • https://xobagosuwetir.weebly.com/uploads/1/3/2/6/132680986/3c5bcbc099131.pdf
    • https://pabaxugu.weebly.com/uploads/1/3/2/6/132695470/wepuzut_woxunebewup_vofuterum.pdf
    • http://lazadacostumercenter.com/871326229325og1l.pdf
    • https://gipodebitu.weebly.com/uploads/1/3/6/0/136000977/233962.pdf
    • https://gejizataki.weebly.com/uploads/1/3/3/9/133997606/7386027.pdf
    • https://puperoriwob.weebly.com/uploads/1/3/4/7/134715375/78e4f56.pdf
    • https://linebabeta.weebly.com/uploads/1/3/5/3/135317009/3312588.pdf
    • https://tuzafezinaxav.weebly.com/uploads/1/3/4/3/134319976/8afcb091.pdf
    • https://muxetomanudone.weebly.com/uploads/1/3/1/4/131406273/lizokalus.pdf
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/4003035.pdf
    • https://siwuluwavati.weebly.com/uploads/1/3/4/7/134756127/a62dec19cf47b55.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vuxirefare/jijerinetozifaw.pdf
    • https://uploads.strikinglycdn.com/files/7441bfb1-ce88-4b9f-9eaa-7a5e4f7fc7f3/attack_on_titan_movie_trailer_reaction.pdf
    • https://uploads.strikinglycdn.com/files/090b93ab-cf7b-4728-84cf-fcbdae2d81e5/53343529044.pdf
    • https://s3.amazonaws.com/remavuj/30377652815.pdf
    • https://uploads.strikinglycdn.com/files/5e8f1b0f-449a-46ef-8e7f-2c88a6e254ec/best_book_on_how_to_become_a_vegetarian.pdf
    • https://uploads.strikinglycdn.com/files/7e5ec800-cfcd-4d0f-b92a-54f360e885b9/91056859030.pdf
    • https://uploads.strikinglycdn.com/files/17afbfdd-1eaf-4b61-80a7-e85fd2eab20e/tidepadelelizanegepu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f48e.bin
882c40dcae7d404af24fe1cfdaaf8db08d1a0b69c455e6c0484749800f90e94d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 5208 bytes
font_01_sfnt_off0001064f.bin
e2886868ce593b3745b0026e82c402a467f54b13d6ef5029492c209582bebaf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1064F 11500 bytes

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