Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf50ae70fea8829…

MALICIOUS

PDF

74.6 KB Created: 2021-05-03 22:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 59f5c9fe243310d392be8df7345a852e SHA-1: 211bd7ed3d1f043c26e2eeaae889a05b961f14ee SHA-256: 5bf50ae70fea88298cf2b011976c3ca9e0770ad440bfcf44de7ab1ba578cb062
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded links, many of which point to disposable domains or redirectors, with a primary suspicious URL being https://jumiwimov.ru/strik. The PDF structure and embedded links suggest an attempt to redirect users to a phishing or malicious site.

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://jumiwimov.ru/strik?utm_term=joe+vitale+jr PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470553/normal_602ca591f3bbd.pdfIn PDF document text
    • http://mufajaku.medianewsonline.com/gimatud.pdfIn PDF document text
    • http://mon-cmbretagne.com/spelling_bee_words_for_7th_grade_20189dhbq.pdfIn PDF document text
    • http://cmbmarketing.agency/hampton_bay_southwind_v_ceiling_fan_partswpepl.pdfIn PDF document text
    • http://xekepova.iblogger.org/vadowe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446651/normal_605c1206208f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_60195bf58c009.pdfIn PDF document text
    • http://inmyshtangen.xyz/31438155200jcn4l.pdfIn PDF document text
    • http://avit0.pro/solve_the_differential_equation_dy_dxy_xy2_x22xq2f.pdfIn PDF document text
    • http://trendmobile.ru/1461431647cr9pd.pdfIn PDF document text
    • http://thrivewebs.com/sapijipaluuioog.pdfIn PDF document text
    • http://jugapus.sportsontheweb.net/hcl_annual_report_2020_19.pdfIn PDF document text
    • http://muvisaxof.iblogger.org/apple_stock_analysis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xixonu/86219062728.pdfIn PDF document text
    • http://pewulalabes.epizy.com/regolamento_ufficiale_burraco.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/ropowopazevosifuwakakaz.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_off0000e616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 4624 bytes
SHA-256: 8e16097410934c390a6b990e15e2d349e20694999dbda327c1e9a1e343665383
font_01_sfnt_off0000f5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 11708 bytes
SHA-256: 69d8b4356cb0bdf5f79f57e7c3ab0d99b4f9fef2ab69f7953011bb603c752ad3

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