Malicious PDF — malware analysis report

Static analysis result for SHA-256 e34b26637eeb39da…

MALICIOUS

PDF

82.3 KB Created: 2021-03-28 08:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e16bc42199c5f2e4c95147cd58b1b028 SHA-1: 16057842490066b365751ea95bb7946331df13e2 SHA-256: e34b26637eeb39da2ee510b661d3aa71f76fb27905b128736d5bf938e675a1d8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain associated with a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/strik?utm_term=black+and+decker+portable+circular+saw PDF link annotation
    • http://ditilage.22web.org/80447710184.pdfIn PDF document text
    • http://vozujuluxe.iblogger.org/98307520046.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/60441388168.pdfIn PDF document text
    • http://xaderupib.rf.gd/mastering_blockchain_packt.pdfIn PDF document text
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_04231a121eaf4c6282cadc91c2b45b06.pdf?index=trueIn PDF document text
    • http://tebuvarajeba.epizy.com/kuwozuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/008c5bac-6740-45c8-994a-44d483508add/how_do_i_file_a_claim_with_asurion_sprint.pdfIn PDF document text
    • http://boterafozove.rf.gd/sharp_aquos_crystal_305sh_firmware.pdfIn PDF document text
    • http://lidiwerefibe.rf.gd/53564159065.pdfIn PDF document text
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_573123368d7b434c95283de82544df32.pdf?index=trueIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_e86d0930f7f64fcd890d21019e675849.pdf?index=trueIn PDF document text
    • https://951e66c5-660f-4748-bfcc-a6cc0831133d.filesusr.com/ugd/4967bb_955c928e0a424630a960c16945032126.pdf?index=trueIn PDF document text
    • http://mevumum.epizy.com/free_cad_software_for_windows_xp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63d0e0a7-f588-48a4-ab66-de79723b53db/sirijaxiz.pdfIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_7205c8523cfa43b8b94cd479d569a2ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/56938064177.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/division_problems_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f2bc6fa-7e50-480e-9d33-34ac96b0a394/human_resource_management_project.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/hcibench_user_guide.pdfIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_1cd08bbf07e14e80b88fcdce84bb6747.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cc72638-e423-4552-81b2-b162f0086476/is_toyota_highlander_a_reliable_car.pdfIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_316e6bb7b74f4db4a27da0618bc0a677.pdf?index=trueIn PDF document text
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_89c4d5a574d64cc28dd4b9e742dd81ec.pdf?index=trueIn PDF document text
    • http://gilemexuwef.epizy.com/magic_quadrant_for_intelligent_business_process_management_suites_2020.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_off0001025f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025F 5412 bytes
SHA-256: 2a00df7b1a4d0708fc5ae8a7604d7b7d22166b355f2a4b3bc9bae9b7ba85dd7d
font_01_sfnt_off000114dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DC 11332 bytes
SHA-256: 52e35b70255a19ad462db76b4f1003416c401097b0e5ca195dd562ae6b16762b