Malicious PDF — malware analysis report

Static analysis result for SHA-256 de824c1524f30652…

MALICIOUS

PDF

83.6 KB Created: 2021-04-15 05:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5dd36e461a368b013e7b7dccf49a20cb SHA-1: 7cf907b5bf093627620e1774b45209669b513a92 SHA-256: de824c1524f306528af42cf174bfa278945e0ad1649283ea281b2efa494013c9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one suspicious URL identified as a potential distribution point. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://vilenefex.ru/strik?utm_term=hobart+1612+sharpener+assembly PDF link annotation
    • https://cdn.sqhk.co/faxinomitux/wFgeXgi/bamazugujoravawekax.pdfIn PDF document text
    • http://debodopox.iblogger.org/zimozapofibavojitubukakij.pdfIn PDF document text
    • https://cdn.sqhk.co/zewumabigige/gkhj4aW/bepojesaridegi.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/ggigjcA/did_you_know_science_facts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_361f79e798814af6ba96c387de481d0f.pdf?index=trueIn PDF document text
    • https://827a6da4-a69c-4806-aaaa-db522494bc4d.filesusr.com/ugd/cb5916_b48e97b34ce240709b36bb7b49abc752.pdf?index=trueIn PDF document text
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_430bd22d95074b27bfb077c284dfdbfe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/lord_of_the_flies_chapter_two_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/rmf_risk_assessment_report_template.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/academic_coordinator_job_description.pdfIn PDF document text
    • http://gejulakan.epizy.com/asx_company_annual_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/54699921344.pdfIn PDF document text
    • https://7b9449e5-51e9-4a7e-81f5-8587c42320f9.filesusr.com/ugd/571bad_1fb733d8a56645d9b30035d1aba6b5a5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/deadpool_video_game_review_game_informer.pdfIn PDF document text
    • http://dasilumenuf.rf.gd/consonant_digraph_worksheets_for_grade_1.pdfIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_d0591305ec2344e19200bfd0dd338876.pdf?index=trueIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_f9a004f4a64842f4a07abf486e2e9f9c.pdf?index=trueIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_a190fe7d5321447191e08e3d054db09a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/peace_like_a_river_lyrics_hillsong.pdfIn PDF document text
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_4fc394f4baa342d981805188a5acb73f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widiku/azure_cli_directory.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/is_marvel_unlimited_available_in_australia.pdfIn PDF document text
    • https://78fc25e8-d533-4ec3-a480-3617e8cc0d4b.filesusr.com/ugd/aa5866_27cb3a2907db43f89b542f9135a52f75.pdf?index=trueIn PDF document text
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_619cd755703048138527905a75c4ac85.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 5600 bytes
SHA-256: 8e58e634b899cae399d6d04f7388fca1dd9a4b2721ec4c1c8f1803261550b442
font_01_sfnt_off00011699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11699 12652 bytes
SHA-256: 24bc3cae1698e3e4c048d0ecd86d1412a668e955b0fd2c48aa857cb4c61528be