Malicious PDF — malware analysis report

Static analysis result for SHA-256 613d248ec2441e6d…

MALICIOUS

PDF

81.6 KB Created: 2021-04-13 10:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 471b86cb352d3f6e00a6eb5e7ceb7be1 SHA-1: af0cbaabc30a37c52449155bfa8d651703d44a95 SHA-256: 613d248ec2441e6da1cb9e1285a3809c0eb2db32bd4dec096098cb9679981c64
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, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. 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 malware delivery.

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://jumiwimov.ru/strik?utm_term=how+to+construct+parallel+lines+using+perpendicular+lines PDF link annotation
    • http://giwudogor.scienceontheweb.net/introduction_to_forensic_and_criminal_psychology_6th_edition.pdfIn PDF document text
    • http://xurixekan.22web.org/credit_bureau_report_rating_gx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450415/normal_6043b5e0d0737.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/how_to_type_power_symbol_in_word.pdfIn PDF document text
    • http://sewakasatixori.medianewsonline.com/19316260270.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_5fd622640a86c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379969/normal_600719a4c5558.pdfIn PDF document text
    • http://giwudogor.scienceontheweb.net/the_theory_of_moral_sentiments_adam_smith_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469640/normal_5ff23881ab01a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413012/normal_604b8916ae0a3.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/swot_analysis_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruredat.rf.gd/pipupixogasefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52b73a30-0351-45ac-8a25-864b8cf2c311/is_garmin_usb_cable_different.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/855638a7-2834-4af2-8eb8-a39c316c1f03/how_to_reset_apc_smart_outlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51814865-b64f-4992-9c0c-31f3f3df5d43/uk_skype_interview_questions_for_nurses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3c00bb6-be94-416a-adf2-dd01841f1def/femirenedo.pdfIn PDF document text
    • http://sasaxunofob.atwebpages.com/assistive_technology_in_the_classroom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f285fa05-a6cf-47a3-8770-ea43977288e8/36769644679.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 5292 bytes
SHA-256: 516c8e2d428033bb552e6646a4498ee4f04a1c1ecbba34cc2d5a0c083a501056
font_01_sfnt_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 10980 bytes
SHA-256: 17cda95096159cea7c8c85b794e9ebf78a85a7d5f7b5f9544b965c81548dcf46
font_02_sfnt_off000122c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C0 16284 bytes
SHA-256: 9330c815f6d41046c2519933307567b15ed2dfffe84bd38854b7360d0d5f730b

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