Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08430ec1335ba5d…

MALICIOUS

PDF

76.9 KB Created: 2021-04-16 01:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d3351a7f57f2479627945364f756cd31 SHA-1: 2d14582cec5b8801b76f6e23f466f3024192c76c SHA-256: d08430ec1335ba5ddd01f84a9c2ecb63629eb430d613ae623e37eb10accaf020
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of external URIs suggests the document is designed to redirect users to potentially harmful websites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/strik?utm_term=how+to+start+yamaha+r6 PDF link annotation
    • http://tinubawolu.mywebcommunity.org/web_to_firefox_plugin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418001/normal_602700eedcc7f.pdfIn PDF document text
    • http://copyrightproblem.com/livro_qumica_orgnica_mcmurry4xiak.pdfIn PDF document text
    • http://rimujitibux.mypressonline.com/tax_administration_definition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476443/normal_60017f3a076d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378149/normal_5ff5b564bad81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390638/normal_5ff90385dbb4f.pdfIn PDF document text
    • http://fufejezonodim.mywebcommunity.org/sagujek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_606c881b53662.pdfIn PDF document text
    • http://avlto.best/993221139818072b.pdfIn PDF document text
    • http://ryukzak.digital/xumijekasekideg82wql.pdfIn PDF document text
    • http://ketotreno.buzz/hisense_r7_review_youtubeb649a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suduxegowur.onlinewebshop.net/systme_bielle_manivelle_exercice_corrig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4e90fb1-eb45-408b-8552-c63d616b0c10/dipomasonoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd06e330-53f9-423a-ac2f-1da8a6bb4a60/41904391035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc4eb9cb-df0b-4dfa-a542-61f56f3e8995/how_do_i_reset_my_lux_500_thermostat.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/disproportion_reaction_chemguide.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/71132926404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14b66212-dd56-4dca-b53d-c2627ad0c562/julian_calendar_vs_gregorian_calendar_converter.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/building_wealth_one_house_at_a_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9fd510b-5fb4-4db3-9fd6-cf55b7b32a30/what_questions_to_put_in_a_quiz_about_yourself.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_off0000ef6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 5204 bytes
SHA-256: d1ec50ba45603d4ff19bfd956c9793b74a61801faebc56eb84e625a59d3dfd2b
font_01_sfnt_off00010106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10106 11316 bytes
SHA-256: d442339b341e0c8f2d6018c9a1e8a4bfd1d9bcdba53c8e8c8dd522c5319c27bb

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