Malicious PDF — malware analysis report

Static analysis result for SHA-256 315a1b671f8e8634…

MALICIOUS

PDF

86.8 KB Created: 2021-03-12 09:11:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 76a51025e6d88ce8878d75c5a524fa91 SHA-1: 9b0754cf1ad245d1c99c27c6bcd210bff8cb60f5 SHA-256: 315a1b671f8e86348cc545299123a8357240779436d6b0d918d340727711ce82
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a technique often used in phishing or SEO spam campaigns to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/123?utm_term=maneuvering+the+middle+llc+2017+worksheets+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4448976/normal_5fce5eb8abb02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480897/normal_5fe1843136aa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_602656e893241.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446924/normal_5fe41f339dd6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409616/normal_6000ecce01ec8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377371/normal_5fde3b62638f9.pdfIn PDF document text
    • http://penerete.66ghz.com/38891629277.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_1413ce12ada34ba3a20b467bba8fe993.pdf?index=trueIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_53fc2d0c393847b19c1790c97c9be581.pdf?index=trueIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_3b0c1f73c21e416fa07fe1da6effa0e2.pdf?index=trueIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_061330d250f54bdf8756b3eebcd34bb0.pdf?index=trueIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_04fed51eddf94476900c95689f770fc0.pdf?index=trueIn PDF document text
    • http://keporeninudo.rf.gd/62650883933.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_374feb214b3d4eb88cfd1a605c23a3d1.pdf?index=trueIn PDF document text
    • http://wuwusawoviwu.rf.gd/bts_album_answer_spotify.pdfIn PDF document text
    • http://zaxenedapepobu.rf.gd/how_much_do_zaxbys_owners_make.pdfIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_f41277398f3346c1a00d925e0701ff7a.pdf?index=trueIn PDF document text
    • http://noxebujo.epizy.com/kevevijinafizozo.pdfIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_ab132322c43e4be9a1ce37959c72d3b3.pdf?index=trueIn PDF document text
    • https://c22e5cf4-338a-4003-9cad-c1cb0be29285.filesusr.com/ugd/3db607_987b36a6240b4d02a07f63fae303d492.pdf?index=trueIn PDF document text
    • http://luwegovufa.epizy.com/ez_cash_payday_loans.pdfIn PDF document text
    • http://wubonaxe.epizy.com/12846751360.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_off000114ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EE 5980 bytes
SHA-256: 640daf2f01859fc9e03b364d1095787b28cae283c281151561c61d080b13d4b2
font_01_sfnt_off00012947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12947 10724 bytes
SHA-256: 0b4bfd98ed449a95834fe1e830cb34e4e0ac0aedfd8bb802b1fcb7c058b160d9

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