Malicious PDF — malware analysis report

Static analysis result for SHA-256 340f3738625fe1bc…

MALICIOUS

PDF

86.0 KB Created: 2021-02-25 00:48:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a8935f05c84cefda8c6394753679ea27 SHA-1: d540812e6a7852b6dbc73de16dbf6182a8541681 SHA-256: 340f3738625fe1bc30ca8b6535e2e54d000eff219b53bd09e6c2ce26011ea782
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains a large number of embedded URLs pointing to various domains, many of which are hosted on disposable or link-farm-like services, suggesting a phishing or malware distribution campaign. The presence of numerous links and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=what+are+the+3+types+of+surface+mining PDF link annotation
    • https://vobakedipevurot.weebly.com/uploads/1/3/4/6/134661611/jigofubemakofo.pdfIn PDF document text
    • https://sozusodugalonus.weebly.com/uploads/1/3/4/6/134614171/repar-daneviwebadukom-boxowilarubive-josidixonav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453720/normal_602724a35f5df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467273/normal_600be37f42242.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/hehmgjZ/number_of_shark_attacks_in_australia_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371800/normal_5fef821123830.pdfIn PDF document text
    • http://mebosopevux.iblogger.org/chinese_bourbon_chicken_nutritional_information.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401732/normal_5fe6544c855d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451563/normal_5fddd1e8a9241.pdfIn PDF document text
    • https://cdn.sqhk.co/xetokive/ic0JOif/funny_voice_changer_software_free_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/jjXQ8zl/vaporwave_ringtones_free_retrowave_ringtones_download.pdfIn PDF document text
    • https://tazesudi.weebly.com/uploads/1/3/0/9/130969012/8047790.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447880/normal_5ff04907ac995.pdfIn PDF document text
    • https://cdn.sqhk.co/pofoxubo/bggXjju/79220945628.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490739/normal_5fc7e5368df9e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sokipev.epizy.com/5002020278.pdfIn PDF document text
    • http://nupedapubamamu.epizy.com/medical_laboratory_scientist_study_guide.pdfIn PDF document text
    • http://befokube.rf.gd/61367598362.pdfIn PDF document text
    • http://nebejobibaveb.epizy.com/facebook_story_saver_app.pdfIn PDF document text
    • http://vatimofaxemog.rf.gd/krashen_theory_of_second_language_acquisition.pdfIn PDF document text
    • http://girifej.epizy.com/98909518312.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_off000112d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D4 5676 bytes
SHA-256: 0afab3776b4d6413377d9869e447c295f7f8dcc2e45e6bd70825222efaf02f7a
font_01_sfnt_off00012612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12612 10572 bytes
SHA-256: 7b3c99480d5a956c968f33de2f1d789156bf86031d197531d1d49548a803ea21

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