Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b1c32ed93e4a5e…

MALICIOUS

PDF

68.3 KB Created: 2021-03-20 08:13:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f453341201c9af068365fbf933303f80 SHA-1: d44bf8ab0c058ce1034f2c4cc34e38d9c3ffc1d8 SHA-256: a1b1c32ed93e4a5e0126f70a24b9efe8dac6c50f7fd603207e2596cc384b1da7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'link farm' heuristic, suggesting a phishing or malware distribution attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to potentially harmful sites.

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-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/wix?keyword=plant+dichotomous+key+worksheet+pdf
    • https://dunijolojuk.weebly.com/uploads/1/3/1/4/131437931/wodizebirixap-nedotipogima-ratojed.pdf
    • https://cdn.sqhk.co/gosukutusu/K5jgeih/batman_the_telltale_series_android_all_episodes_download.pdf
    • https://juviroxekeko.weebly.com/uploads/1/3/5/3/135399696/fivulepebita-rizopanitemeku-zozejuwexotem-pavalelibez.pdf
    • http://fakurivevid.scienceontheweb.net/lg_g4_stylus_manual.pdf
    • https://sivubatololux.weebly.com/uploads/1/3/4/8/134850937/3803473.pdf
    • https://static.s123-cdn-static.com/uploads/4425772/normal_5ff9ced75015a.pdf
    • https://xelipifexejup.weebly.com/uploads/1/3/4/8/134848770/jegomigemupelo.pdf
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5fd2a7eaf0e85.pdf
    • https://cdn-cms.f-static.net/uploads/4370092/normal_6048404138305.pdf
    • https://static.s123-cdn-static.com/uploads/4386330/normal_60090f84a5a9a.pdf
    • https://fenuligor.weebly.com/uploads/1/3/2/6/132695430/7465981.pdf
    • https://cdn.sqhk.co/gogojelawov/Skhd9EP/photomath_online_calculator.pdf
    • https://ronaleju.weebly.com/uploads/1/3/1/4/131482819/82c4d28.pdf
    • http://tozofuji.scienceontheweb.net/16084552610.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_e7c881f714594b9e976a14cf66f6f1c3.pdf?index=true
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_2a39f2f3b8ef409d996642770e8b0af5.pdf?index=true
    • https://b2bd4247-5771-4f9a-9f3f-b46500bff287.filesusr.com/ugd/f41bfe_97569a82a36145ee90278b5b5f57e7a7.pdf?index=true
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_e6b259b9d1fc493c83c53ab1983dbf5e.pdf?index=true
    • https://e39bfc17-a898-4016-ac91-fc9303c112df.filesusr.com/ugd/b5068a_7c7add995e614c12b3aa7091b4479bc4.pdf?index=true
    • 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_off0000cf6d.bin
5cac21bd89ab9350652354610231524f525da5b48863fc73da4a3da0c9749781		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6D 5652 bytes
font_01_sfnt_off0000e297.bin
7bfc88adcfc74ced63920a6cb05ffc4e5b69bed140b522c370896b5a519b123e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE297 9864 bytes

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