Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ac82b5d09cea34…

MALICIOUS

PDF

72.5 KB Created: 2020-12-29 10:56:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 924d1448257be060ace56c2730864e8e SHA-1: bc056254f97401da052720e8e9280b08ec095449 SHA-256: f1ac82b5d09cea3452059907474f00318d21dc281ee52bbf828cf45e7edae9d3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm or phishing campaign. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate that the primary function of this document is to redirect users to potentially harmful external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/123?utm_term=thermos+replacement+parts+philippines PDF link annotation
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/2655001.pdfIn PDF document text
    • https://mitenipup.weebly.com/uploads/1/3/4/3/134363071/5b90fe5626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393369/normal_5f9cf256e7f9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368760/normal_5f87a2f1c141c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447460/normal_5fb83516f0d32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5f87f03412c2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378405/normal_5fb28a3be0888.pdfIn PDF document text
    • https://xizejaselaz.weebly.com/uploads/1/3/4/3/134357450/katekivap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409255/normal_5fc6dec50a07d.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/6a3cd771-2089-44ef-b6f5-ff6218a215fb/sns.set_style_whitegrid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7ccd2f-5e99-4bac-930e-d422518e8d62/womokugu.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/luzuxuvepikel.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_off0000df51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 5124 bytes
SHA-256: c4a9cd02c269897008d8058b75826c7f52a415ee8236a65df763fcefdd65c533
font_01_sfnt_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 10844 bytes
SHA-256: 69f6a4f9825cd0e713f07c99f94382e337add7fc06b21c4f834e9f331e010693

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