Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ba6b1e16409f6f…

MALICIOUS

PDF

76.2 KB Created: 2020-11-25 02:43:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d109ffd979991c8f4d311f986505599e SHA-1: bc5cde17aff15bace12c209bbf5968f8881c6b8d SHA-256: d7ba6b1e16409f6fe60521f424650d1fd2ed42d7c10b6f6af4bf29c8bbba72a3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains or are part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest an attempt to redirect users to harmful content.

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://traffset.ru/strik?utm_term=facet_wrap+ggplot2+scales PDF link annotation
    • https://zarimuxeve.weebly.com/uploads/1/3/4/8/134897304/648b08741a737.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422658/normal_5f9e04680388a.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://s3.amazonaws.com/gixawetopoli/xejofenowalu.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/vomefumeg.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/nobusoserexipakazoba.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/english_revision_sheets_for_grade_1.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/49110374489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e273c6bc-1fb4-4750-84cf-a034b11cfc83/titobesovitogidogopi.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/79763121672.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/asana_pranayama_mudra_bandha_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4c43136-f075-4bad-8a4c-a813d03afb8d/loropowomu.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_off0000dd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 4944 bytes
SHA-256: 93b638b2eeab31d8ddc6fc5b29c48c54f83a32266e0397e48a7405dd51ed623a
font_01_sfnt_off0000ee60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 11896 bytes
SHA-256: ff17771fdad2f3955f34aa98058e13a46b3e5253f1fc413c5605f4e83bef95ba
font_02_sfnt_off0001163e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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