Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fcd32bdf595e798…

MALICIOUS

PDF

39.7 KB Created: 2020-11-07 01:01:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 95113666437f6517e219ae4b53736612 SHA-1: ef9357dad9f0017262c060c4decc7ea4943f0928 SHA-256: 1fcd32bdf595e7988ae55dc6957e8cc71b9fa7f8480e5ca78485469d14e09061
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1071.001 Web Protocols

The PDF document contains numerous embedded links, including a suspicious URL related to 'extreme injector unknowncheats', and a heuristic firing for a 'PDF_SEO_LINK_FARM'. It also includes an instruction to disable security software, indicating a malicious intent to bypass defenses. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed to exploit users or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://trafficel.ru/aws?keyword=extreme+injector+unknowncheats PDF link annotation
    • https://nogulumu.weebly.com/uploads/1/3/4/4/134476008/daboxopaxu-gojixazabinuke.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/8067084.pdfIn PDF document text
    • https://mizunawakore.weebly.com/uploads/1/3/1/4/131406356/dodiko.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/c64c8e66-1187-4b37-a386-c1aebb140404/dulita.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/30743757937.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/55818186980.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/nuxokatekudaguja.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/dry_under_eyes_makeup.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/sabelageb.pdfIn PDF document text
    • https://zesibeb.files.wordpress.com/2020/11/metropolitan_achievement_test.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/67932719616.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_off00005a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A65 5264 bytes
SHA-256: d07b7c1a7e660e9487b6d11a10fe70069d10e03e24a3dd5edd8508c216ffbe6f
font_01_sfnt_off00006c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C38 11204 bytes
SHA-256: 1726225bb432756e75667c5a639c4a51635bbf6c45ebd891e2a3b9ffcad4106c

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