Malicious PDF — malware analysis report

Static analysis result for SHA-256 4136af88d16b083f…

MALICIOUS

PDF

84.8 KB Created: 2021-02-16 16:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 879efff033f4fe7580cfee6d0db3119a SHA-1: 4c35fafb7ab070669d873706238d7a64c9e6e089 SHA-256: 4136af88d16b083f91bc070a4c96d85e62cfd0f1d8245994e7e586e55a2c711d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and the link farm heuristic point towards an attempt to redirect users to malicious content.

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://druttle.ru/strik?utm_term=is+scrum+and+agile+methodology PDF link annotation
    • https://cdn.sqhk.co/bapulofuw/ioidxUi/66589157148.pdfIn PDF document text
    • http://extraterrestrials.space/kosasobegenuxiwdzir.pdfIn PDF document text
    • http://myyshooop227.site/m._b._a_di_full_formrs10j.pdfIn PDF document text
    • http://fisusuwisefib.22web.org/10398814233.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/K0MgcEU/74521044430.pdfIn PDF document text
    • http://copyright-supporthelp.com/kipoletozarogaminizakm8iy.pdfIn PDF document text
    • http://datingdate.site/publisher_small_tent_card_templateiw3v2.pdfIn PDF document text
    • https://cdn.sqhk.co/kerikone/agciihb/progress_report_project_management_example.pdfIn PDF document text
    • http://cyberlife.store/belling_oven_timer_manualfbfmw.pdfIn PDF document text
    • http://ita-women.space/critical_thinking_activities_for_higher_educationzurcl.pdfIn PDF document text
    • https://cdn.sqhk.co/lojegalivo/hcyggqU/best_free_voice_changer_discord.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/djeBoZd/76234871751.pdfIn PDF document text
    • http://uablog.website/resadobupt3v1.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/guxosa/biology_o_level_summary_notes.pdfIn PDF document text
    • http://nuxijezusuwep.rf.gd/log_in_sign_up_form_template_html.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/695626172.pdfIn PDF document text
    • http://wukosinigi.epizy.com/32404700736.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/petg_material_data_sheet.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_off00010dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAD 5392 bytes
SHA-256: b44740fb49a29303d1e8255af10e87c1af35a29291bfa46a9ba4f169f6d606de
font_01_sfnt_off00011fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDA 11124 bytes
SHA-256: 01160a8d65a6c93cda0431ff141a4206b80f04642637f625d216416727146bcb

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