Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d74f3d96750529b…

MALICIOUS

PDF

69.8 KB Created: 2021-01-07 00:10:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d172a1e8b551457dd4e097f8198d539a SHA-1: 91687a42f10742931bfd52d677e56a7f3c5e649a SHA-256: 8d74f3d96750529b03c6f73bc46b5bd4472dd9fb4db77064a2e5d76b1ea45d14
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=amsec+safe+manual+esl10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486359/normal_5fda34f6cc9bd.pdfIn PDF document text
    • https://cdn.sqhk.co/xewimoziwuvo/gishghh/86474616873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476925/normal_5fdb024bcfaac.pdfIn PDF document text
    • https://cdn.sqhk.co/suxumeva/vthf2jb/zavabige.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385635/normal_5f944bce510a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5f8a979db478e.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/hdbhcgh/97130627701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494868/normal_5fdb15c9633b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387577/normal_5f8f13a66b5b4.pdfIn PDF document text
    • https://jufapagemegugux.weebly.com/uploads/1/3/4/8/134860181/vapawitukovusom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446377/normal_5f9e7e21cc2d4.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzewekafan/jtifgge/13785957269.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_off0000d47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47E 5116 bytes
SHA-256: 5c7c0fa494612c091d2c9977269f7d5207b744289831548c333a48ba0a016274
font_01_sfnt_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 10772 bytes
SHA-256: 23683f4e7b2d0f14a84e742adb63b390e04b1f860c4f4be709f5dee8537e9e15

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