Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93cfadfde2347d4…

MALICIOUS

PDF

90.3 KB Created: 2021-03-02 11:33:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9d3c360acf4b006acb914152545b3f3a SHA-1: 5ecc3334c107aeb1b3ef68fc5b40a848bd4d792b SHA-256: f93cfadfde2347d4ca787079d0969bdd8fdd0079f3dc293b62523a9e4fa85c92
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://jumiwimov.ru/strik?utm_term=middle+school+trivia+questions+fun PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379615/normal_5fcb30d58e087.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466140/normal_5ffd0d4bcf043.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485454/normal_602c411b70c9e.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/bevasofilelunefozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_602b2df8a2c10.pdfIn PDF document text
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/b704ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468553/normal_602f48555728e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401994/normal_5fe64317946ab.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/gcgjhby/65240654411.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481699/normal_5ff169dc818ac.pdfIn PDF document text
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/sibenuz-medowozaruv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501028/normal_603112561b6d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490367/normal_600b637227e00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382973/normal_5fe78504728cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_5fd389be3558a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pozidijapepore.atwebpages.com/17776254469.pdfIn PDF document text
    • http://bitines.myartsonline.com/bujirifixufokanaga.pdfIn PDF document text
    • http://sasaxunofob.atwebpages.com/present_perfect_continuous_exercises_perfect_english_grammar.pdfIn PDF document text
    • http://rowoniwetob.atwebpages.com/libro_del_seor_de_las_moscas_completo.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DA 5180 bytes
SHA-256: d72c7cf71c85918d628341239871fedfcce4f9b2e0b348606b5f235e810be162
font_01_sfnt_off00012775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12775 11260 bytes
SHA-256: 5ebfa558e399e1bda2404eff9a5fdaad200cc975e9ec3dbd7980541128171c00
font_02_sfnt_off00014d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D9C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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