Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1549553254f337f…

MALICIOUS

PDF

79.3 KB Created: 2021-03-23 10:39:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: db1e532779017557f295dafd9a2d5d07 SHA-1: 8a8007b5ae00bc8e656c0e1583dde90b02e34a93 SHA-256: e1549553254f337fcf028c156495be98997177cfc90824a84e1971b162775ac7
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, suggesting it functions as a link farm or phishing lure to direct users to external sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, leveraging disposable hosting for its links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://nipisod.ru/wix?keyword=causas+del+bullying+psicologico PDF link annotation
    • http://megatorg.ru/how_does_urea_pass_through_cell_membranerfvsw.pdfIn PDF document text
    • http://bluebadgeform.com/2000_kawasaki_mojave_250_owners_manualo7fdu.pdfIn PDF document text
    • http://gumazesetijub.iblogger.org/towajufizevasikupofun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454047/normal_601f6675251d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387412/normal_5feb5faaaf9f8.pdfIn PDF document text
    • https://fovokifijinibe.weebly.com/uploads/1/3/4/5/134582558/5d1962fd975fd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404725/normal_5ffaac987880b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488332/normal_6047e2ad10b29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408352/normal_6034c217d2e23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445534/normal_5fcc2ce56ce1f.pdfIn PDF document text
    • http://tonimaxuta.iblogger.org/partitioning_method_of_clustering_in_data_mining.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425507/normal_605546a275ff5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485828/normal_6044e0648a586.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421051/normal_5febf4e95a49a.pdfIn PDF document text
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/f517b3e3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://megutid.epizy.com/1585511864.pdfIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_2d2da61d7bf14960951641a5115738b6.pdf?index=trueIn PDF document text
    • http://jibufunipibavu.rf.gd/zowezujixebenagazasu.pdfIn PDF document text
    • https://7ce190f9-fb8d-496c-a51a-ce151dcc024a.filesusr.com/ugd/e72def_f18f31e3a6324adc9937f5407cd6fa85.pdf?index=trueIn PDF document text
    • http://jenusaselilavat.rf.gd/how_to_write_an_sop_navy.pdfIn PDF document text
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_393750f590e64c02867653fa008506c3.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_off0000f71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 5292 bytes
SHA-256: 67774dae1abc7ee95a5743ddedcd5092910ae68f05e9a957b05b98e63c04294d
font_01_sfnt_off00010932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10932 11352 bytes
SHA-256: e7424637dbe7f3c2a940b72b524748d38e18ffe0ee6568253962c59a99861e05

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