Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d306ffd5627b5e4…

MALICIOUS

PDF

75.5 KB Created: 2021-04-04 02:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b1316b7852f4803aa999a2549cd91956 SHA-1: c033315a2cfe3591924522ac85f96c12c3dd22c6 SHA-256: 3d306ffd5627b5e47cb5c5f7289f0aebd9c88009c9f1c50ee9e77235f0c95e94
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and other free hosting services, indicative of a link farm designed to distribute malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect the user to potentially harmful websites.

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://zajinet.ru/strik?utm_term=heat+exchanger+calculation+engineering+toolbox PDF link annotation
    • https://wojanoxunoliwam.weebly.com/uploads/1/3/5/3/135394081/290460a14e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475737/normal_5fff52b8caaa3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417118/normal_5fcaf4cf927dd.pdfIn PDF document text
    • https://fegejakir.weebly.com/uploads/1/3/5/2/135299458/4894284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369525/normal_6039ad8221f14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402737/normal_6008876b5ddf9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385014/normal_5fee8c2907322.pdfIn PDF document text
    • http://bebinovixox.iblogger.org/giwonoza.pdfIn PDF document text
    • https://paxituzupinemof.weebly.com/uploads/1/3/5/3/135303349/7320526.pdfIn PDF document text
    • https://pudijeda.weebly.com/uploads/1/3/4/5/134586696/6266e42a87c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477913/normal_5ff4df03a9ca1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382962/normal_603caa12619ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_60454c1f8c3a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403806/normal_605a67f2a3f54.pdfIn PDF document text
    • http://zipibafof.iblogger.org/josigivukemixomuvo.pdfIn PDF document text
    • https://vesepuzimimewij.weebly.com/uploads/1/3/0/7/130776402/6132763.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374852/normal_5fe2724e3d7e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://minuvuri.epizy.com/35263789687.pdfIn PDF document text
    • http://gadivedu.rf.gd/32421064099.pdfIn PDF document text
    • http://fanomibifub.epizy.com/31670501705.pdfIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_74da8b1242b74b5eb0858f4685034252.pdf?index=trueIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_2e4b62a25efb4e89b1a06e2761145faf.pdf?index=trueIn PDF document text
    • http://zukufefomuzaz.epizy.com/burger_king_uk_allergy_information.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_off0000ea51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 5052 bytes
SHA-256: 48dd6c35d6f267332e47d3ca8a9be4d2585217c1544cf93b6ec20a69da269a79
font_01_sfnt_off0000fb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7B 11168 bytes
SHA-256: d07abfd42ce026d1c245ad7d0d073db0f0a0325a46785d07d209dc0ba088bc4a

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