Malicious PDF — malware analysis report

Static analysis result for SHA-256 601891b5e0255636…

MALICIOUS

PDF

107.8 KB Created: 2021-03-16 07:48:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d5d127af5a7c7df3183b54b4d83fdbaa SHA-1: 956db90df2112641cf3090dac8cca8d76bd3f8e7 SHA-256: 601891b5e02556367b5609e49b7cb18908cebb04fd9a7d6df35887eaf4dae139
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 heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to numerous other PDFs. The primary external URI, 'https://maypoin.ru/award?keyword=sepsis+management+pdf', suggests a phishing or scam lure. ClamAV detection and ML classification strongly indicate maliciousness, consistent with a phishing or malware distribution campaign.

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 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://maypoin.ru/award?keyword=sepsis+management+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485799/normal_60322cec43e24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409801/normal_600ff63d491a3.pdfIn PDF document text
    • https://vuzaruluweketex.weebly.com/uploads/1/3/4/4/134478477/94fc77b9dd59a4.pdfIn PDF document text
    • https://fiverepibimasi.weebly.com/uploads/1/3/4/8/134893498/8694559.pdfIn PDF document text
    • https://buzomuzugagi.weebly.com/uploads/1/3/4/3/134313884/dorumuxarurana.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367275/normal_5fece7ad7aee2.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/takurugilij/66433010261.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/68509993527.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/22425544907.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/adobe_reader_for_android_2._2_free.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/copper_mountain_snow_report.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/xumewaxezutumeviwovun.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/71106638716.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/how_to_reset_icom_v8000.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/business_income_and_expense_worksheet_excel_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/wibafunuledotijirid.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/acr_bi_rads_atlas.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/kesavebibuxugupunatulem.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/47451929077.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/menutel.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_off00016956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16956 5336 bytes
SHA-256: a3b938ab09228c8694e0c2b7aa8b98d357b3ae783ebdcae19f8edbea254cff3e
font_01_sfnt_off00017b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B6B 11660 bytes
SHA-256: 29758da3289d64a5afbd2ab3282767b5a12a383fca0cff2ad2362ebf497dc7d0

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