Malicious PDF — malware analysis report

Static analysis result for SHA-256 d154b6d72c5126ad…

MALICIOUS

PDF

68.7 KB Created: 2021-02-15 21:52:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 673ad34b6fb89511df2c03cfc2b82746 SHA-1: a7bd72ef9ca88dac3717eda49b9c1236b44496a6 SHA-256: d154b6d72c5126ad386bf4142ade68e5aa700a4a169342ea061cff9ab40ef4f7
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services, indicating a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of URLs like 'https://bologen.ru/strik?utm_term=grammar+english+lessons+for+beginners' strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/strik?utm_term=grammar+english+lessons+for+beginners PDF link annotation
    • https://bivixogerixud.weebly.com/uploads/1/3/4/4/134469213/diwemidaxavo-nepotezuj.pdfIn PDF document text
    • http://nomerojelevat.22web.org/72324031014.pdfIn PDF document text
    • http://lufesemi.iblogger.org/77425991546.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/lijhjgh/mojoworiponixez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuzapulemukepux.epizy.com/beyond_compare_free_ubuntu.pdfIn PDF document text
    • http://litutowi.epizy.com/worksheet_for_grade_3_english_comprehension.pdfIn PDF document text
    • http://mobisojew.epizy.com/acet_reviewer_2019.pdfIn PDF document text
    • http://muvalinifotu.rf.gd/momavuze.pdfIn PDF document text
    • http://mizebonemis.rf.gd/certification_template_philippines.pdfIn PDF document text
    • http://zofutigo.epizy.com/76245952734.pdfIn PDF document text
    • http://binawojojin.epizy.com/bengali_parikhit_bala_baul_song.pdfIn PDF document text
    • http://jegigas.epizy.com/66073147377.pdfIn PDF document text
    • http://fugodijuw.rf.gd/houston_texans_injury_report_week_4.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AC 5352 bytes
SHA-256: 2eb95b7cfdf62df2ee8c5fa5c641b4d9c34692f580f80b90cc359e503dbf1503
font_01_sfnt_off0000e3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B9 9996 bytes
SHA-256: ab5c0d1e45d7445f85d4d980fb69fe8656715d4343dde8ce9dd183690d67b0c4

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