Malicious PDF — malware analysis report

Static analysis result for SHA-256 82caaa55356a2a3d…

MALICIOUS

PDF

67.8 KB Created: 2020-12-26 01:34:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cf2fd7fd3d00422a4f3e0a190d1eda03 SHA-1: d4ab7df838e763f2f5945475a749421e6875b529 SHA-256: 82caaa55356a2a3dd27868c90c1c19eee777e1e6c058bf9a74b859a389bf31f7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The presence of a large number of external links suggests a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document, likely delivered as a spearphishing attachment.

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/aws?utm_term=libro+sobre+el+aura+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369164/normal_5fe3f72bb0db7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405929/normal_5faef48c13be3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423189/normal_5fda7c0a1adf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370090/normal_5f89160a0c9d1.pdfIn PDF document text
    • https://bosogafowobalo.weebly.com/uploads/1/3/4/6/134614472/manet-rademavofekus.pdfIn PDF document text
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/b0ad856fe72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387241/normal_5f99153d72942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375080/normal_5f97c37b3635e.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzezufe/jjqiejw/shoot_merge_number_puzzle_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/tonuviwa/gehfggi/back_office_dental_assistant_job_description.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/df56cb8a-6779-4f53-9f8b-292de3052d53/penalty_kicks_addition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6cf95ac-12e9-4530-b6a3-6491aad26f06/hallelujah_chorus_soprano_part_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c48c69b-4e00-4095-9c62-94a55df07f6b/wajegomaxagamaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9382400-8b39-4a89-8f5a-48a15b55775d/xugugile.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_off0000cc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0C 5116 bytes
SHA-256: dc1b6d63ec1db2ce8c1deda3605c7382e26d9279be56615879c769caaf89be73
font_01_sfnt_off0000dd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7C 11416 bytes
SHA-256: e817a63869b16a55b8f0ce560f642837c73685a78612cc736688f6d4b4a66586

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