Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e8fc5169b252aa…

MALICIOUS

PDF

42.5 KB Created: 2020-11-08 03:07:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d6f2844cb23cf73c2ec288ea1e7f5316 SHA-1: 1a9ef7790a9056ab463ec825c4e35e5554c50eba SHA-256: 54e8fc5169b252aaf13d71967707702a04082029a15176dc6017ff9788e369f1
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO spamming operation. The primary URL identified is https://traffset.ru/123?keyword=refactoring+martin+fowler+pdf, which is likely used to direct traffic. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links aligns with techniques used to artificially inflate search engine rankings or distribute unwanted content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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/123?keyword=refactoring+martin+fowler+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381759/normal_5f9f100417ee5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374696/normal_5f8d33f9db22a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403674/normal_5f91fd6fe9974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379855/normal_5f95ac05c959b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_5f875ae853352.pdfIn PDF document text
    • https://mosejibufo.weebly.com/uploads/1/3/4/4/134437632/3100821.pdfIn PDF document text
    • https://zufeburiz.weebly.com/uploads/1/3/4/3/134320035/ca2a0c4fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445882/normal_5f9f6485704f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417644/normal_5f9a1e8b436e5.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/3f8d525f-360f-4b99-b12d-9d926509db0d/nokeke.pdfIn PDF document text
    • https://jopafez.files.wordpress.com/2020/11/luxenifinuzejomerutif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/637e9ce9-d473-4209-a034-1507e97b5c01/recursos_que_se_utilizan_para_desarrollar_las_ideas_en_los_prrafos.pdfIn PDF document text
    • https://tilemidif.files.wordpress.com/2020/11/28127747322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0e54990-e026-4c39-836d-c772953f673f/5-4_special_quadrilaterals_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acf05baf-c8de-417d-bc99-25f64123163d/gujizekokigowedomojej.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_off000061f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F0 5396 bytes
SHA-256: 657b8b1cb113ab4673a00bd5e46d1d8e52aa3e6030656848b13fa92a379d138f
font_01_sfnt_off0000744f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x744F 12340 bytes
SHA-256: 6fb185254f5bceb18a7d93b552b10112f2c8cfebf88280cdf1f4b320c1faa58d

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