Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d698e3f4994ff70…

MALICIOUS

PDF

76.5 KB Created: 2021-01-04 00:42:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 967dc14af20b04c3139d5fbf7af0d070 SHA-1: b8e1ce1a8004dd326bfca855ea0c5fffd14f71bf SHA-256: 1d698e3f4994ff7003f89b6d53bb0fb533316eaee3c77767700805dad4741710
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to direct users to potentially harmful websites. The presence of embedded URLs and the ML classifier's high confidence score further support this assessment. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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?utm_term=riverside+high+school+greer+sc+enrollment PDF link annotation
    • https://nodopemewave.weebly.com/uploads/1/3/2/6/132682748/boguvaxom.pdfIn PDF document text
    • https://zowusisovote.weebly.com/uploads/1/3/5/3/135304915/mixodunalet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478685/normal_5fad2dc216733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373519/normal_5fa3c9b865806.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381973/normal_5f8e64062d71c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381737/normal_5f922bc6d49b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485434/normal_5fdc31e91bda0.pdfIn PDF document text
    • https://cdn.sqhk.co/jetobatu/tUig0jg/13517515764.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/gefewa.pdfIn PDF document text
    • https://xukoxaxap.weebly.com/uploads/1/3/4/7/134748194/ruxubadoxozuwulosisi.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/zetituri/one_clue_crossword_answers_chapter_20.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/givezebapobofazabitule.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_off0000e06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 4996 bytes
SHA-256: 8c9b2af76a5d2ee0c4d66897131656af3e27faecb272ea03a4e075f349004671
font_01_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 11084 bytes
SHA-256: 4650d20cae7c7376f89afc11ec3563a6e70c8b957deabb026921ca52ca1d6413
font_02_sfnt_off00011702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11702 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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