Malicious PDF — malware analysis report

Static analysis result for SHA-256 969c9aca5cb62358…

MALICIOUS

PDF

67.2 KB Created: 2020-11-25 23:11:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d7bf0d3f484bf9e1ca103b9a1225a0c7 SHA-1: 231332883f1609fff75729d413aaa4f6284ad435 SHA-256: 969c9aca5cb623586a5bf20b9b78d5ccd1cfca7dfdd606aecbece600e9342e50
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 heuristics indicating it is a link farm and has been flagged by ML classifiers and ClamAV as malicious, specifically a phishing trojan. The embedded URL `https://traffnew.ru/aws?utm_term=math+worksheets+addition+and+subtraction+printable` suggests a lure related to educational materials to redirect users to a malicious site. While no scripts were explicitly extracted, the PDF structure and external link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/aws?utm_term=math+worksheets+addition+and+subtraction+printable PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428039/normal_5f9c6c7e0aa45.pdfIn PDF document text
    • https://bokorakalawu.weebly.com/uploads/1/3/4/6/134643693/bajogafe-fatimedewet-saloxu-nojamabigikuvox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389084/normal_5f99164319aa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375522/normal_5f8f19e178eb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386620/normal_5f9df70ade819.pdfIn PDF document text
    • https://tivagojeno.weebly.com/uploads/1/3/4/7/134714391/5774751.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424037/normal_5fa7b41580abb.pdfIn PDF document text
    • https://dozogifelezu.weebly.com/uploads/1/3/4/3/134313369/gikogedotud.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/6fc4c4cd-f12b-4fe2-a5a3-2ca0fe9ad25b/vobozi.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/59073146086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbbece84-476f-4718-8a65-c436e042ae64/aquascaping_books.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/company_letterhead_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bf61a44-a055-4989-8e38-ab81474d23e9/quincy_junior_high_school.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_off0000c8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DD 5460 bytes
SHA-256: 6d7b90b2f97c20f7a1f2bdc573511852f894b45fb7395b8e0768e9a3bc36506d
font_01_sfnt_off0000db7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7E 10460 bytes
SHA-256: 338dcc20b602e2df2cebbc671bf6123335e196f7e9a9aaa9a5a9796fd992567d

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