Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8cde02d783399a…

MALICIOUS

PDF

62.5 KB Created: 2020-11-14 18:00:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fca3783c7a4a46060dc3430ef84c8377 SHA-1: 4d9db7a2dad4eb9802b082ddea8e0a1697ef2b9d SHA-256: ba8cde02d783399ae186703e0d1383c99d6b310e5892b75596be6ba54c76b101
214 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to 'Economist pdf download'. The presence of numerous external PDF links also points to a link farm strategy, likely for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=economist+pdf+download In PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/kamoradonume-kedimexivojofuv-jubuxogugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425924/normal_5f98f8ed78c80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376866/normal_5f8bf4cb876fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412591/normal_5f9f2db8b1ebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5f8faa0912125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_5f8f923ce19cb.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/d95b256c-d060-4c6a-a64a-ec34e57b36da/lusasamamis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2b13f77-7980-4186-b0d3-db80787fa0a2/medical_terminology_quiz_with_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/096aea38-0188-4d9c-811e-e7cf0a10ace5/23556998313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f572f4fd-fd21-4ae0-ade8-e666903847be/gander_mountain_dehydrator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ccc2f4d-9f10-41bb-b747-b0d8ea99e58c/gawutebedo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4f485d5-76f5-43fa-a6c1-3e8a778c36e4/dekixujunabunig.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_off0000b5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BB 5252 bytes
SHA-256: a472bdcae7e5522be397a9a7c17174b57863c2341f3258b893397bb322a0a17f
font_01_sfnt_off0000c7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A7 11084 bytes
SHA-256: 6f19566abf7f448afaf10cc9736e75ca06fea20313ad95d12fe2ec55ac032a85

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