Malicious PDF — malware analysis report

Static analysis result for SHA-256 4205393ba1953091…

MALICIOUS

PDF

71.8 KB Created: 2021-03-31 00:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 747359744a224205e63191e5061c8b0c SHA-1: 4531a1b6907aafb70e06e8f9cdccc7bb0f3b2058 SHA-256: 4205393ba19530913ebcfa0d9650ec010b8fd118d9e0c19220171e171806d327
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains and Weebly, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/wix?keyword=ncdpi+math+standards PDF link annotation
    • https://kivuvuvilex.weebly.com/uploads/1/3/2/7/132741385/32f14c5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389794/normal_60338eb6bc4e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482418/normal_606160aa8a438.pdfIn PDF document text
    • https://jovinafunen.weebly.com/uploads/1/3/2/6/132695325/4456349.pdfIn PDF document text
    • https://fisujurij.weebly.com/uploads/1/3/1/4/131437504/1d9662d2057efd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387816/normal_6041665e3c0f8.pdfIn PDF document text
    • http://keepxufi.space/lenovo_g50-80_drivers_windows_7_64_bit4c9m1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445880/normal_60322080484d6.pdfIn PDF document text
    • http://uuuuull.space/piwefopupojb8ags.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/sotejov.pdfIn PDF document text
    • https://vazejaxos.weebly.com/uploads/1/3/1/3/131382607/ropusozibu-muxexomakuruga-rasetukoparuk-kubut.pdfIn PDF document text
    • http://sodalabs.club/bubivekenobululivotepo6n520.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472775/normal_5fef34286349b.pdfIn PDF document text
    • http://comp-arenda.site/golosa_student_activities_manual_answersdsnf8.pdfIn PDF document text
    • http://mizarofu.22web.org/training_need_assessment_format.pdfIn PDF document text
    • http://milanbeach.fun/tumaradupixiznnmb4.pdfIn PDF document text
    • http://jowivuv.22web.org/alto_sax_major_scales_finger_chart.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d11d894-8296-4fb9-8ec2-04d551648f5a/43437003457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/574f21b6-d7af-4b9e-9391-ff9b3cc28ef0/best_air_fryer_convection_oven_consumer_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab4f747-1748-4c84-8076-f4162cdf4569/zusekenugenafiwofazuvew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52428fc5-4230-4183-906c-c06b79126267/406054192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ce3fa27-5423-4ff0-b94d-ad28bb0698a1/pirates_of_the_caribbean_medley_piano_musescore.pdfIn PDF document text
    • http://vujiwexamofone.rf.gd/whats_a_spiritual_blessing.pdfIn PDF document text
    • http://winupenelipumo.epizy.com/lansakan_worksheet_grade_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf78281c-4c2d-491d-8e91-0183786e6e6b/the_crown_season_1_episode_7_accuracy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b60c0cf-dcd3-4c6d-b29e-8a0565f98487/62603323394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48d27836-5dbc-4aac-adb2-a13383ba44e3/23210261049.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_off0000da5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 5252 bytes
SHA-256: fd7b56ea9076ea6f63b95dddb24492615400a25fa61a9d9c8e89b1fd22b557c9
font_01_sfnt_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 11428 bytes
SHA-256: cdb4f7fa364194cf73177ae2a8b4dc2df64a4ae5114a81909e924c2008320387