Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b7b52b24add9de…

MALICIOUS

PDF

75.8 KB Created: 2021-03-08 17:52:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 79f6d70a38d2f0751aefc20c2eead4a9 SHA-1: 519dfbfc03dbc4c9e2db7eda10ecf2531b4a02ed SHA-256: b4b7b52b24add9de6a783501524c9597cdc4b4a2c679e809c5f066a131e05926
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 flagged as link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/strik?utm_term=what+is+the+bolt+pattern+on+a+2013+dodge+charger PDF link annotation
    • https://rupanusevufow.weebly.com/uploads/1/3/1/3/131380126/8557138.pdfIn PDF document text
    • https://tuzejaved.weebly.com/uploads/1/3/3/9/133997948/c79b03.pdfIn PDF document text
    • https://cdn.sqhk.co/bedazume/jbDij0S/hand_cross_stitch_embroidery_designs_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/supekokabe/mQ2jehg/wevidomanifexirilezuwix.pdfIn PDF document text
    • https://leruvipox.weebly.com/uploads/1/3/5/3/135347136/53acc73b64babb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494431/normal_6026d7f6d7dcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382643/normal_601330bfaaa92.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/yamaha_moto_4_350_tires.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/haLhdur/weather_live_app_review.pdfIn PDF document text
    • https://zejuvuvegodefi.weebly.com/uploads/1/3/1/4/131453892/a8e893628951650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_6045e131ed41d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455194/normal_6040371205f7e.pdfIn PDF document text
    • http://netopodimamo.mywebcommunity.org/is_ninja_a_good_blender.pdfIn PDF document text
    • https://boxotajisosuni.weebly.com/uploads/1/3/6/0/136086252/7464356.pdfIn PDF document text
    • https://cdn.sqhk.co/firijanab/gje2vCA/online_web_api_compiler.pdfIn PDF document text
    • http://taxokijoba.sportsontheweb.net/how_to_use_a_lathe_milling_machine.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/old_school_hip_hop_music_mix_download.pdfIn PDF document text
    • http://wopizup.mypressonline.com/list_of_bharat_ratna_award_winners_till_date.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rabatelekovufar.myartsonline.com/brother_mfc-j5910dw_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/excel_chimney_installation_manual.pdfIn PDF document text
    • http://sakogabutal.onlinewebshop.net/70280750657.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/what_is_a_loop_in_programming_language.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/80848367045.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/49526960020.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_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 5980 bytes
SHA-256: adc0673f95b39e3e3aa18f0e4600134a4aee503103bb8ca63e03d10cc79504ad
font_01_sfnt_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 10368 bytes
SHA-256: b8442b5b6d1e590b72282210035f09c2b3532e0ce54a28d0fb3a2d185841d993

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