Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76ac1aad2ba953f…

MALICIOUS

PDF

74.7 KB Created: 2021-03-22 00:02:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e4b7c2d19f8d38ee61132d4a0acb6113 SHA-1: 308ffc8b184a73093de92f3a9e91057eeba96d9f SHA-256: b76ac1aad2ba953f32fd43ba39f39630efaf9f8533492ade6b822145f197a093
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable hosting or redirectors, suggesting an attempt to manipulate search engine results or direct users to malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://xezojetit.ru/strik?utm_term=shark+genius+steam+pocket+mop+not+steaming PDF link annotation
    • http://yildirimotobursa.com/xemugutowbl5ax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413242/normal_60494892c74f3.pdfIn PDF document text
    • https://gilawidukawopux.weebly.com/uploads/1/3/2/7/132741225/9446914.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389603/normal_5fdd31f29fdb6.pdfIn PDF document text
    • http://iciko.xyz/free_convert_paint_to_word78uc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475212/normal_6036a24c494a4.pdfIn PDF document text
    • https://zavowije.weebly.com/uploads/1/3/2/6/132680855/2212351.pdfIn PDF document text
    • http://leoidet.xyz/xubapiremonowofirogigiwebzf28l.pdfIn PDF document text
    • http://lnstagramverifycentre.com/betukadivodatuxen0q1jz.pdfIn PDF document text
    • https://zijedizadof.weebly.com/uploads/1/3/4/6/134692085/f1ffdfc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0621fd1-c5b8-4336-bdc3-cc8adc26a2c9/xudapodemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec74683c-cfd4-4f76-b93c-1538eeed2733/how_to_make_lots_of_money_trading_penny_stocks.pdfIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_771cd72e62d543e38be4b080b4560f2c.pdf?index=trueIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_8f0b18e6c4cb475781a88a84dc1fd21f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ad854f6-dcfd-4502-9e60-c413a489fd6b/financial_algebra_textbook_answers.pdfIn PDF document text
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_4a38f30d6ade41349b89c68448834a7c.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_off0000e2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F3 5480 bytes
SHA-256: 9729bef9041df29863f0ae93a0801ca058b8bcba0bb970d7c97966507c649885
font_01_sfnt_off0000f572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF572 12044 bytes
SHA-256: aaa2849bd8d8a279ede05b6392a6a44693a56d8e2b94201e590e169b26acdcbe

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