Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4589ccd20afff9…

MALICIOUS

PDF

70.5 KB Created: 2021-03-22 02:54:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 893e10547a1e749766f58281ce7f26b9 SHA-1: 71d0663e82fc87ef2b71f1bd90fc3bc88f31f7a0 SHA-256: 5f4589ccd20afff9380b67711cf699b380c0fc935499276183caffcc1c42c642
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'link farm' designed to direct users to many other PDFs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://zajinet.ru/wix?keyword=pdf+superman+red+son PDF link annotation
    • http://pusapev.scienceontheweb.net/interlinear_bible_hebrew_english.pdfIn PDF document text
    • http://midimox.getenjoyment.net/small_business_ideas_in_tamil_language.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/zisulamisozoto/who_invented_the_telephone.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_b4bf57c127044476886bf6813114161e.pdf?index=trueIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_551bfd180483468ba0b29e631925add1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/fizija.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/latest_6th_pay_commission_report_karnataka.pdfIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_bca2e482e33f4a31b6c702d719e1e959.pdf?index=trueIn PDF document text
    • https://4868a29a-6d77-448d-a9c5-bc5c6a1713c3.filesusr.com/ugd/060e50_80d3d857182a45619260fdc70fd370ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/iz_somewhere_over_the_rainbow_ukulele_tabs.pdfIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_a197f735202840f2a112ab586d865200.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/covid_19_test_centre_jobs_leicester.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/flannel_sheets_queen_deep_pocket.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/how_to_drain_keurig_water_reservoir.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/film_acting_resume_format.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/25348172365.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_off0000ca09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA09 5156 bytes
SHA-256: 103c7d4dd5bdd476a262eb030b020ed047ed29972083f22da217a825058ddac7
font_01_sfnt_off0000db7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7F 15856 bytes
SHA-256: 0576ff7afe0675a1869aa9ee5b331e0e20d87714a70ea6ab138b86826efd25fc

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