Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b389fb1373b148…

MALICIOUS

PDF

185.3 KB Created: 2021-04-02 12:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d5befb9ec3bbced2b2a7cb061859163 SHA-1: 7ae6aad46f3461fda9a3aa68d7e89fb8a42c1abf SHA-256: c8b389fb1373b148af4d005241618a34e7c9b47535dc56a878de5b95f723c2a0
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, one of which, https://mezovuduw.ru/123, is directly referenced in the heuristic findings. The document body, though heavily obfuscated, suggests a lure related to 'simple html templates for beginners free', indicating a social engineering attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 4

  • 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://mezovuduw.ru/123?utm_term=simple+html+templates+for+beginners+free
    • https://static.s123-cdn-static.com/uploads/4411479/normal_5fe15f87250d7.pdf
    • http://duwelizub.mywebcommunity.org/fepobe.pdf
    • https://cdn.sqhk.co/lopijikuvi/sKuieib/important_days_in_year.pdf
    • https://static.s123-cdn-static.com/uploads/4374532/normal_600272cae7b03.pdf
    • https://cdn-cms.f-static.net/uploads/4460070/normal_6060e65e51ad1.pdf
    • https://cdn.sqhk.co/zolewiko/Shgekib/45345244063.pdf
    • https://xukujeferok.weebly.com/uploads/1/3/4/4/134435440/wovejut.pdf
    • https://static.s123-cdn-static.com/uploads/4446633/normal_5fc7461248dfd.pdf
    • https://zilisekisami.weebly.com/uploads/1/3/1/4/131437354/gobimojewojib_vovixotimaxez.pdf
    • http://xuxijosut.sportsontheweb.net/how_to_thread_singer_201-2.pdf
    • https://cdn-cms.f-static.net/uploads/4405945/normal_6043c074ad25a.pdf
    • https://cdn-cms.f-static.net/uploads/4476443/normal_5fe9420b77f42.pdf
    • http://jijomaj.getenjoyment.net/perianal_abscess_treatment.pdf
    • https://cdn-cms.f-static.net/uploads/4370560/normal_602a33bdcbcc2.pdf
    • https://cdn.sqhk.co/tavaxikanabu/MgcIFie/rugeju.pdf
    • http://wekanisa.scienceontheweb.net/kedovikojenis.pdf
    • https://cdn.sqhk.co/xawodoze/4kUaqTF/kirexadexoxevidosisokeper.pdf
    • https://bonesinidojesu.weebly.com/uploads/1/3/4/5/134591006/d58318723a25fe.pdf
    • https://cdn.sqhk.co/zixajofazadi/qjeshb3/rush_crazy_games.pdf
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/gutapileba_xodigupevojirak.pdf
    • https://static.s123-cdn-static.com/uploads/4494166/normal_6005176a3ca4e.pdf
    • http://jikusofare.mywebcommunity.org/yongnuo_yn-568ex_ii_nikon_review.pdf
    • https://static.s123-cdn-static.com/uploads/4420766/normal_5ffc3026e956e.pdf
    • http://dosaxixapaxa.medianewsonline.com/magelunanabesiresalab.pdf
    • http://vodabutopidaru.getenjoyment.net/58625944991.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00029095.bin
77ad503427a5489eca2eb05778ecc31eacb73df57f06e5af8ac617544d1f1b24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x29095 5348 bytes
font_01_sfnt_off0002a288.bin
f71f41cb0b5cd8b0e5cb72979be8ee2f426480a54df85cfd0c320611b7cf0e4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2A288 11152 bytes
font_02_sfnt_off0002c875.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2C875 4324 bytes

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