Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f96a04cba0c676…

MALICIOUS

PDF

75.1 KB Created: 2021-02-28 13:02:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 94a2fe7b436a650c222a535cc20b2524 SHA-1: 3c6007c3b9d94b7ba46c58b8173ce4dd58a782d1 SHA-256: 77f96a04cba0c6769c4fc9884c9ffb3706a407036a615f2e6a55bad001c26d2d
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified as a link farm, with one prominent URL suggesting a Firefox download. The ML classifier and ClamAV detection strongly indicate maliciousness. The document's structure and embedded links suggest it is designed to redirect users to potentially harmful content, likely a phishing or malware distribution site.

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://resalured.ru/award?keyword=firefox+48+download+64+bit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445125/normal_5fd67f9bd807d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427085/normal_602e4f23da474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422637/normal_6011ebbe67ff5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368952/normal_5fddc351dcd85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404313/normal_5fe2c14975f9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462036/normal_601a9a006505a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427103/normal_5fe4100e6a43e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486566/normal_5fcbafb0738db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461763/normal_60354ac55883d.pdfIn PDF document text
    • https://cdn.sqhk.co/luwibajik/Smhjhje/75240713167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383149/normal_5fdab7a1e6b74.pdfIn PDF document text
    • https://kixarazebeda.weebly.com/uploads/1/3/0/7/130776474/7788ef85ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://navasegekukuj.epizy.com/89044802533.pdfIn PDF document text
    • http://jofesosozofoso.epizy.com/wix_embed_viewer.pdfIn PDF document text
    • http://kanisal.epizy.com/jotafesu.pdfIn PDF document text
    • http://lebozid.epizy.com/mapfre_insurance_annual_report_2017.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_off0000e8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CE 5412 bytes
SHA-256: b7c312527dd43997ef5d69406a48af22b1122b2aa303bc6e5e0e862f7a13b0c0
font_01_sfnt_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 10520 bytes
SHA-256: 552b1147a5597e7c47fdb7aa979ab1999bf467b56ff0415c52eb55b92f92c34c

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