Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb35efa53dbb631…

MALICIOUS

PDF

87.8 KB Created: 2021-03-15 16:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f050d444198f0e63e83d524fb6a1524a SHA-1: 8791f1ea7d4f949d6663ec1c32e8a72125e432b2 SHA-256: ecb35efa53dbb631cacda64eca551a83d733dfa1b9c2b87aa7cd7e1bc7b3f4f7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/aws?utm_term=the+land+of+open+graves+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488317/normal_6026eb1d4e70f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494677/normal_5feebd16658fa.pdfIn PDF document text
    • http://pomuropujuj.22web.org/43317251926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458132/normal_601cdbcd476ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_5fdbbb0bcde26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392442/normal_604ecac7b9d87.pdfIn PDF document text
    • http://wixedorozed.iblogger.org/caracteristicas_del_ensayo_argumentativo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483346/normal_603e2c9c6a684.pdfIn PDF document text
    • http://kosufezegaxid.iblogger.org/kikejulofulubilixojupitub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366313/normal_5ff045db011ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445892/normal_602a0995881e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497078/normal_6011aa4ac00f2.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/zategafozasiru/vijivowativesogaliwa.pdfIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_302aed2d70ef487db2ac3ca5b3b887a4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bogijexu/waropawolamatulojowetif.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/amiga_forever_plus.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_7598912bda134da6a81192c4ea2e3337.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/total_dailies_one_multifocal_fitting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/dobubadutiru.pdfIn PDF document text
    • http://sevuvev.epizy.com/kasamazuxuwika.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/the_future_of_life_insurance_companies_in_india.pdfIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_00cadae627b04a54b234dda5ede52f6a.pdf?index=trueIn PDF document text
    • http://wizifaj.rf.gd/7671332002.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_off000117a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A0 5568 bytes
SHA-256: d506b822be9e38a4fe84e5b984d9509b2dc469cc6f2a84fdf714575baf372a8b
font_01_sfnt_off00012a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A78 11240 bytes
SHA-256: 16221e88de721cc054696434d5ad7a91a86be078c61933f1fd7038b5cc086c5c

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