Malicious PDF — malware analysis report

Static analysis result for SHA-256 b039e064df039d46…

MALICIOUS

PDF

71.8 KB Created: 2020-12-21 19:26:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f2372319ba9d5f524dcbfc5af6ab926a SHA-1: 1b1f5856eb2a19b42b82460fd6085717c4910063 SHA-256: b039e064df039d465a5906989c94956b02cefe1a33cfb4c0a71871a5fbe34c47
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 0.9997

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://trafffe.ru/123?utm_term=the+speaker+exchange PDF link annotation
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/zuramonuro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470532/normal_5fc9ad3b47e0e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a703f492-7fff-46a4-a8e8-8dfedb32c847/roxivavozopuxix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ef1e5fb-3469-47ae-96f4-cecf6871d74a/torafujesibikewujojul.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f7235687f52b6b817f64/t/5fc17c125147b148046b9e24/1606515731326/49696819337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df86770-3cad-4d5c-8440-2dbe9558f413/zugobefirowonogerem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69a7e8d9-7f3c-4718-86a8-1101266a1c89/muzibuxil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ce524b6-8f6d-4a87-9666-194f3cfd5c96/48191983706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bea58e1-94e8-4d6e-800e-f9b67a821625/28787250129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/473d0368-5afc-4001-8e2e-62053d408dba/doxofezisonaxun.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c66b27a199023ab4af32/t/5fc1384a18e72e5fdb03a89c/1606498378214/lux_testing_app.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe32821972c46e3c69a541/1606300290507/xikewapeguxogot.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF99 4796 bytes
SHA-256: 92c7f27130576bae7cc558125e6361dc226771781310375f8b835e2041fa9bb9
font_01_sfnt_off0000dfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCE 10732 bytes
SHA-256: a0de9f6cc8ceaf076d47e4ecf6b00e537224e235b7c8a5648455153f2b298555
font_02_sfnt_off00010440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10440 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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