Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a234f0eea8053f…

MALICIOUS

PDF

82.0 KB Created: 2021-04-06 20:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bee2720435f2f13b426da06f5b1510b SHA-1: 6b7d64946ec00ab3930055de7b2a65013ff415ed SHA-256: d9a234f0eea8053f9f675298f3a1564572c68d399937e70ae556ee5bd9409c6e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, suggesting a link farm designed to redirect users to malicious sites. The embedded URLs likely serve as part of a phishing campaign or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=is+lemony+snicket+still+alive
    • https://siroxaje.weebly.com/uploads/1/3/4/0/134000026/fafipogav.pdf
    • https://static.s123-cdn-static.com/uploads/4372982/normal_5fcea69bbe890.pdf
    • https://cdn-cms.f-static.net/uploads/4403260/normal_604f8c6503c97.pdf
    • https://vogizezadu.weebly.com/uploads/1/3/0/8/130814341/60063.pdf
    • https://fugakesuj.weebly.com/uploads/1/3/0/7/130776648/4129189.pdf
    • https://rezusoroporinon.weebly.com/uploads/1/3/2/6/132695427/veluveludexiwa_sagijivivu_mozus_bowabizu.pdf
    • https://cdn-cms.f-static.net/uploads/4369324/normal_6042b5b39be15.pdf
    • https://nanewibogexuro.weebly.com/uploads/1/3/1/3/131382113/bezitefi_kopefolekotedem.pdf
    • https://pesopipuni.weebly.com/uploads/1/3/2/3/132303043/pififolipoxote.pdf
    • http://tells.fun/musapudua158y.pdf
    • https://cdn-cms.f-static.net/uploads/4387035/normal_60220c185d913.pdf
    • https://static.s123-cdn-static.com/uploads/4482216/normal_5ff7829469efe.pdf
    • https://naviguxiva.weebly.com/uploads/1/3/4/2/134266723/89f3ed34cf1fd68.pdf
    • http://bottlechainworld.com/xuzowowatasoteayo8y.pdf
    • http://sipoxamux.22web.org/bilutikezop.pdf
    • https://lelorovosa.weebly.com/uploads/1/3/1/0/131071021/2170587.pdf
    • https://mugevodotigo.weebly.com/uploads/1/3/0/7/130740084/f336d7645b8b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wujaxon.rf.gd/botanica_oculta_paracelso.pdf
    • http://bumumewevebav.epizy.com/hyponatremia_european_guidelines_2014.pdf
    • http://vunodakurawofo.rf.gd/recommendation_letter_format.pdf
    • http://nekaxikafixof.epizy.com/sumewatabutoguser.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_off00010450.bin
3cc6397e6e9436d0b13da0e32c869c90e073c909b6f81a3647806e26a62c8171		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 5012 bytes
font_01_sfnt_off00011561.bin
6491c6ef994579fa4ebca794dd2185d23c2582214768979a67c09ef3df352834		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11561 10940 bytes

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