Malicious PDF — malware analysis report

Static analysis result for SHA-256 74fef26f5be71709…

MALICIOUS

PDF

80.0 KB Created: 2021-03-20 12:35:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7b586f9f414af902c1fc634ad56bab7f SHA-1: 6a670de70d0ecf7aa3814be1c0286db60eb7b90e SHA-256: 74fef26f5be717097481e113088cfc98778a29dbb6b57eb54cfe927dd99f9b1c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further content or engage in phishing. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://dugedepap.ru/123?utm_term=building+foundations+of+scientific+understanding+pdf PDF link annotation
    • http://dixunawizodel.iblogger.org/85546887662.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403556/normal_5ff3c4e495369.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392661/normal_5fd9261d00f2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379618/normal_603ac531f1a64.pdfIn PDF document text
    • https://tekofudarazot.weebly.com/uploads/1/3/1/3/131381521/58c507fd4334df.pdfIn PDF document text
    • https://kurepisafigovu.weebly.com/uploads/1/3/1/3/131398088/5199512.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/cf9c3c5da0.pdfIn PDF document text
    • https://wixepivod.weebly.com/uploads/1/3/0/7/130775856/8848182.pdfIn PDF document text
    • https://busedulaxuxelo.weebly.com/uploads/1/3/1/3/131379622/a7f44e19af6f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455370/normal_5fda9862113f6.pdfIn PDF document text
    • http://tuderoba.getenjoyment.net/botnica_livro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368230/normal_5fcc60f0c1d70.pdfIn PDF document text
    • http://sosogemizibu.mypressonline.com/educacion_en_alimentacion_y_nutricion_libro.pdfIn PDF document text
    • http://dafagaketa.sportsontheweb.net/pdf_buku_agama_buddha_kelas_10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457312/normal_6033c27dd6766.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_cc236c1d809b4bc49ae26ca960d37f7a.pdf?index=trueIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_5bc98931a8874ae6b6420d09e74fdf26.pdf?index=trueIn PDF document text
    • http://jozobudesurarab.onlinewebshop.net/ruvirejoke.pdfIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_391b5ebb18444fe5a172b9d37c230f59.pdf?index=trueIn PDF document text
    • http://dafafigu.rf.gd/cien_amigos_scholarship_2018_winners.pdfIn PDF document text
    • http://litorow.myartsonline.com/vedic_astrology_books_free.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_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 5372 bytes
SHA-256: 2b5ad6ccb33e9ef25089e145a1512fa939dc315cae35aa4837e86b0fc35bbdef
font_01_sfnt_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 1936 bytes
SHA-256: 7420db9ec41012b263dff8e0d039d2a895961a6b4c1647eabbcd20f441fad98a
font_02_sfnt_off00010d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D72 10688 bytes
SHA-256: baf579f5079c439c3680ba8c982db7d39d4a2174ed87cf63428399fb68295117