Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ff240db51dcd12…

MALICIOUS

PDF

72.8 KB Created: 2021-03-12 19:29:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21944f08769e2c30df9b1f8a08f36d32 SHA-1: 14efa523f3c9fc3907aa7119a833a26bc0c7903d SHA-256: d7ff240db51dcd12520e3f0bc508fa4086cbd93b465b9d202f427ddc4f0743a7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The PDF contains a large number of external links, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent to redirect users to potentially harmful content, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/award?keyword=cbse+class+12+science+syllabus+pdf
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/7985540.pdf
    • https://cdn.sqhk.co/bikegola/jUpg3T4/dedumiwirabupodife.pdf
    • https://static.s123-cdn-static.com/uploads/4390999/normal_5fee82630bbbd.pdf
    • https://wezawemexa.weebly.com/uploads/1/3/1/4/131410399/wowexojotijigek-sasimewiwukigag-vogol-dabod.pdf
    • http://volosaty100.xyz/8410574562myzu8.pdf
    • https://morutasatosode.weebly.com/uploads/1/3/4/3/134366393/8857750.pdf
    • https://static.s123-cdn-static.com/uploads/4464534/normal_5ff2e3349aef7.pdf
    • https://cdn-cms.f-static.net/uploads/4463277/normal_601d239d3a180.pdf
    • https://dobetabuzaduguz.weebly.com/uploads/1/3/5/3/135312815/fatowagefex.pdf
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/8798979.pdf
    • https://cdn.sqhk.co/bukulavor/c7GLjbP/minecraft_1._12_free_windows_10.pdf
    • http://ovca.space/joyetech_evic_vtc_mini_atomizer_shortr7j4i.pdf
    • https://zatikavetix.weebly.com/uploads/1/3/2/3/132303242/6bfcc05b1ee9.pdf
    • https://mijezuri.weebly.com/uploads/1/3/0/9/130969422/825c8.pdf
    • http://organic-ita.space/mastoiditis_tratamientoe8jkp.pdf
    • https://ronabamipiboti.weebly.com/uploads/1/3/4/5/134598089/jikejumujiminex.pdf
    • https://cdn.sqhk.co/jugemito/V1iaiiz/rebibusedi.pdf
    • https://cdn.sqhk.co/timadupak/gdghrgc/aces_of_the_luftwaffe_review_ps4.pdf
    • http://tvoeobrazovanie.fun/34348692691od0wo.pdf
    • https://static.s123-cdn-static.com/uploads/4450355/normal_5fc7dae44973b.pdf
    • https://cdn.sqhk.co/penutizufib/gjhiiii/47948406786.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000dfac.bin
1a731d779d6b290c472265036ecf047928ab7c9a39cf8b840a44efa0d6e6b962		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 5384 bytes
font_01_sfnt_off0000f219.bin
5f88c3493a633607f1cc7d276776ff3e5d8d5da46017c7e9f2618012196e34d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 10532 bytes

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