Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4f2b29a52fa7a9…

MALICIOUS

PDF

71.7 KB Created: 2021-06-03 04:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b522bb8301ddcd02fd4138503c364eb SHA-1: 2c544f0b1d1f9a3634b7852fa9485d57932044ea SHA-256: 2f4f2b29a52fa7a96c03332327252d3e32fc3d52ff2e18e77814290cddbe9451
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are likely part of a link farm designed to deceive users. The primary URL, 'https://chcial.ru/pbw?utm_term=prometric+exam+sample+questions+for+nurses+pdf', suggests a lure related to exam preparation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to 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://chcial.ru/pbw?utm_term=prometric+exam+sample+questions+for+nurses+pdf
    • https://cdn-cms.f-static.net/uploads/4376125/normal_600ad86869a66.pdf
    • https://zewelujipe.weebly.com/uploads/1/3/4/8/134846298/bogon.pdf
    • https://static.s123-cdn-static.com/uploads/4402932/normal_600821c3617f1.pdf
    • https://cdn-cms.f-static.net/uploads/4471992/normal_60410292525c1.pdf
    • https://static.s123-cdn-static.com/uploads/4393026/normal_60068ed016a3d.pdf
    • https://zazivepug.weebly.com/uploads/1/3/4/3/134359823/lidis-pojavuratuwup-pasesafenax-zozovesuviv.pdf
    • https://butabefuje.weebly.com/uploads/1/3/1/4/131437434/logum_zegutijolelib_zisubore_xosidarap.pdf
    • https://static.s123-cdn-static.com/uploads/4384149/normal_5fc75b2bc8264.pdf
    • https://razitesewiwi.weebly.com/uploads/1/3/2/8/132815022/3431674.pdf
    • https://cdn-cms.f-static.net/uploads/4485570/normal_605d49f4e5d5a.pdf
    • https://zivuxava.weebly.com/uploads/1/3/5/9/135991205/lulefutumuneb_badesoxegiz_garil_dobajikuboku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/911f58d4-a9db-4db3-83b8-b86c3888e30d/how_to_renew_your_drivers_license_in_new_jersey.pdf
    • https://uploads.strikinglycdn.com/files/442ad5f2-9997-47b2-8eec-b22400bc87eb/gumapedagasutanemefulo.pdf
    • https://uploads.strikinglycdn.com/files/9ef794a2-1bda-429f-b696-e45999987a82/dua_e_qunoot_in_urdu.pdf
    • http://dajodovilav.pbworks.com/f/who_is_doctor_joe_dispenza.pdf
    • https://uploads.strikinglycdn.com/files/5acf760b-f75b-4833-871c-fc1452e8e892/16494745491.pdf
    • https://uploads.strikinglycdn.com/files/abed1d19-c044-490c-8237-ddef0462e5b1/characteristics_of_bacteria_worksheet_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/ad88a2de-3960-4957-8990-6917e3f2c3fc/13882028196.pdf
    • https://uploads.strikinglycdn.com/files/a699a9ce-7062-4a7f-9585-500d25836cc6/hidden_pictures_color.pdf
    • http://xetibubib.pbworks.com/w/file/fetch/144424974/pearson_edexcel_gcse_chemistry_textbook_answers.pdf
    • https://uploads.strikinglycdn.com/files/b59abb7d-13a9-4d66-84ac-1de6db6351d8/multiplication_table_chart_1-20.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_off0000d9a1.bin
51106ee3831ac7fd1a7e811fb8a66d7acd106ece9625946545d6e9cf7a2213b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A1 5496 bytes
font_01_sfnt_off0000ec3a.bin
fd90febcade9700e312308e92626e7614d9b9b835b4ace29e8d6d23852221370
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 10976 bytes