Malicious PDF — malware analysis report

Static analysis result for SHA-256 7309eb447e4849d0…

MALICIOUS

PDF

82.9 KB Created: 2021-03-20 06:09:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ed156ae0ca8e5dd559b5142c68845a78 SHA-1: 5e95cdaac4dd148edfd1ae45d11b7d09ed6a44c9 SHA-256: 7309eb447e4849d081c319c7caa160f42084af8c16a5b3ae661e1ee19152a36a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://maypoin.ru/strik?utm_term=elizabeth%2527s+act+of+supremacy+and+uniformity PDF link annotation
    • https://cdn.sqhk.co/batumozi/Yyicihg/autonics_panel_meter.pdfIn PDF document text
    • https://cdn.sqhk.co/nifemifufeju/H5je2jd/arctic_animals_worksheets_for_preschool.pdfIn PDF document text
    • http://fiterewupaz.22web.org/adjective_and_adverb_worksheets_for_grade_4.pdfIn PDF document text
    • https://cdn.sqhk.co/lumolixuwo/jY6giii/razupavulafudewomopano.pdfIn PDF document text
    • https://cdn.sqhk.co/kikepedu/jbljgqm/vifofo.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/navakabuf.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/73231322628.pdfIn PDF document text
    • http://sotowalef.22web.org/havoc_brother_song_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/CRFyjfk/zoom_cloud_meetings_download_for_mac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_7083bde14dba4ea78bff5175a5ce08dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4c3d692-2b19-4dfc-a258-fc8631ca0d50/nikon_coolpix_p510_digital_camera.pdfIn PDF document text
    • http://gujavez.rf.gd/canada_map_assignment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f8de0b9-fce7-4b8d-97b5-5f429009fca5/sunbeam_cool_mist_humidifier_instructions.pdfIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_ef22c2903fa04e9bb28cab70e5064772.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9c8d414-fda6-47c1-aef2-62b0c545656d/linear_signals_and_systems_lathi_solutions.pdfIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_2a959f9177ff4d0e8b08db71a7f573a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c533b30-eaa0-424f-aa43-46db45b5cd75/buzolojiredunetijegatin.pdfIn PDF document text
    • http://jaraduvexuzufe.epizy.com/what_is_process_innovation_in_generating_project_ideas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7157ff2a-b59f-49f6-9cbd-c348ecbc9e3c/does_medicaid_cover_child_therapy.pdfIn PDF document text
    • http://wudafozejuniv.rf.gd/62715229631.pdfIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_73466316aeec4a5a931d128decefc5e4.pdf?index=trueIn 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_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 5680 bytes
SHA-256: 7be0034e84e41fb0838300a3daaa613413a585e9f2c0e6c16e06704e826b054a
font_01_sfnt_off0000fe8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 10516 bytes
SHA-256: f736ecf450bdf951a23f9e6deeb69304aa36323a62fa5f204a75d0549fc40bcb
font_02_sfnt_off00012290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12290 18256 bytes
SHA-256: 1ae8468ffa512948246d510935f6e0ce45fabc7a64834a7eb235b3aca969bb71