Malicious PDF — malware analysis report

Static analysis result for SHA-256 268fcbf3758da95d…

MALICIOUS

PDF

68.8 KB Created: 2021-06-01 11:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 00cb450263b832f341661abac3a8f239 SHA-1: c450c59186650f4285d720e44708fefbc730c326 SHA-256: 268fcbf3758da95d4c10b784c498919f5386b20f38f3ea022a6b6de0e15c3799
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, with a primary suspicious URL being https://krisoc.ru/pbw?utm_term=asi+se+dice+level+3+workbook+teacher+edition+pdf. The document body, though heavily obfuscated, suggests a lure related to a 'workbook teacher edition pdf'. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://krisoc.ru/pbw?utm_term=asi+se+dice+level+3+workbook+teacher+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464852/normal_605047a3ea501.pdfIn PDF document text
    • https://nulesurusisozi.weebly.com/uploads/1/3/4/7/134744420/259c13ed03f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457011/normal_5ff0c30474de4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_6061517b87948.pdfIn PDF document text
    • https://milafesubori.weebly.com/uploads/1/3/4/7/134745217/xomupodizi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5fd7a39435f4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463287/normal_5fca3c5796eb4.pdfIn PDF document text
    • https://zedowami.weebly.com/uploads/1/3/1/6/131637063/1bb93128.pdfIn PDF document text
    • https://balalowomave.weebly.com/uploads/1/3/0/7/130738893/7998876.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4483587/normal_60aff2ac7eb77.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kefimazusob.pbworks.com/w/file/fetch/144424968/diferencia_de_contabilidad_administrativa_financiera_y_fiscal.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/w/file/fetch/144414402/joderugumodomodibijowi.pdfIn PDF document text
    • http://niluputevi.pbworks.com/f/exercices_sur_les_angles_cm1_cm2.pdfIn PDF document text
    • http://sonopewobu.pbworks.com/w/file/fetch/144417936/american_pie_reunion_full_movie_in_hindi_dubbed_download_filmywap.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144424098/pivurexurofesi.pdfIn PDF document text
    • http://xutosop.pbworks.com/w/file/fetch/144440031/technic_launcher_cracked_download_2020.pdfIn PDF document text
    • http://zezimin.pbworks.com/w/file/fetch/144413367/63768518767.pdfIn PDF document text
    • http://pagorevet.pbworks.com/f/epson_status_monitor_3_windows_10_64-bit_download.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/w/file/fetch/144427335/54254984990.pdfIn PDF document text
    • http://ridelox.pbworks.com/w/file/fetch/144449790/how_does_auto_choke_work_on_honda_lawn_mower.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE84 5752 bytes
SHA-256: 031a282eb03b5692bdb9bca3ae845886ba0838a4326e632b0468ff4f256af820
font_01_sfnt_off0000e221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE221 10444 bytes
SHA-256: 7e61d339baffca88b8e4c60fec49425101e153481f465ffedda2bf0cd57b788a

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