Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df9a63af4cbd688…

MALICIOUS

PDF

77.6 KB Created: 2021-04-16 15:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 34e7e6d2f7a618e67e90dbb765c36324 SHA-1: 843e724a77771567fbc5bb474e1a6e59b9db70b3 SHA-256: 0df9a63af4cbd688fca301104692d7230da72e518821b3d713d3ed59bf25162e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on services like Weebly, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan threat. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baarspo.ru/strik?utm_term=hp+pavilion+27-qb0070in+price PDF link annotation
    • https://nimivumunekal.weebly.com/uploads/1/3/3/9/133999229/sixaviduzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383805/normal_6029ae0716f7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388596/normal_6013ea7d0e986.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449987/normal_60607eab1d431.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408001/normal_601774b1069ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486963/normal_6028bf27e3e76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471230/normal_601ce7171aae5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383704/normal_5fde12e35fa63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408992/normal_5fc7a483deef2.pdfIn PDF document text
    • https://minaraxu.weebly.com/uploads/1/3/4/7/134765114/nidumib.pdfIn PDF document text
    • https://tovijivesigaz.weebly.com/uploads/1/3/5/3/135327805/tunajujufajavit_zorat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369190/normal_600523cbd83d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369782/normal_600404498a9b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376606/normal_600258ff5b5bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475739/normal_604079a085726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470209/normal_5fd84e5a981d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418166/normal_600123699962f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_5fda02dcdf5ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450512/normal_5fcc1595a4ee3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383138/normal_5fe2c49fbcb8e.pdfIn PDF document text
    • https://berisojelo.weebly.com/uploads/1/3/0/8/130874511/punukavotatit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454821/normal_5fc5e109af29e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375351/normal_6025f170c63f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ef69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF69 5424 bytes
SHA-256: c6ba9f32c2be9c315cf3991048724eadba265704d6280d8d0502c160a2de9ce4
font_01_sfnt_off000101fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FB 10908 bytes
SHA-256: 767763a064a4684432710e4cdb96f2b605cd913941e56888faf1df5c3968155b

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