Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9ca559cc4bd934…

MALICIOUS

PDF

67.4 KB Created: 2020-12-07 18:45:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0abaffc519c06c50cc8ceac65c84164d SHA-1: 9de93b011482b288948025e12b60b45f19f7b68f SHA-256: 6f9ca559cc4bd93429d27669d318891453f2463f18641d37f61b6eaa5fc62fec
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/strik?utm_term=old+churches+for+sale+in+florida PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452612/normal_5fad2532b1e13.pdfIn PDF document text
    • https://zesawomu.weebly.com/uploads/1/3/4/3/134321331/9b9e857ec3659.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/de3c93f9-cad0-4143-84c9-485a0b5fa7d6/jolukunifomem.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4f8ee085bf90c0e173f98/t/5fc67daee6d49a06bb73edaa/1606843822597/52719826657.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0873a11f6a4198483d0f6/t/5fc540e89d7936484039873e/1606762731457/14576432278.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54a5dc30a162e0c6f8caa/t/5fc6aee8e18c5c478ee81bc7/1606856432187/music_land_disney_youtube_channel.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc55b95df132613bbdb4396/t/5fc940b656acec624b6ba89f/1607024825000/15767590810.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf8ff4e98326c02d5e4ab/1606285570821/38875365586.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc575d0b8467722f1f2951c/t/5fc6a3cf7acac6192aaca402/1606853584157/fazowumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c8c527c-9b3d-47da-9eec-16d1fadb54d2/asus_memo_pad_k0w_rom.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe10d14f98375720a7f5ed/1606291684261/52011848640.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf65c1af5bf52c326bd92/1606219359483/zefifoge.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_off0000ca6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6F 5136 bytes
SHA-256: 85b44446d5eb2a6b11d239a63abaeb8b15b21e833e7e0459d98295d5c4a5f6fc
font_01_sfnt_off0000dbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDB 10760 bytes
SHA-256: 86aa2c6e36036bb15dd23e8c63881106a805d2c55a31d85b53fc3061d93f8e6c

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