Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f21209c3d8b2348…

MALICIOUS

PDF

51.5 KB Created: 2020-11-05 09:31:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 97d1c64dac901fbd49ee7f801cff3349 SHA-1: 7f9ff3d3521315123f33001fec81befd70723965 SHA-256: 9f21209c3d8b23486efbafa49c8ca1047df4013b0085d7df816fb9900837e525
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains URLs that likely lead to malicious content or further infection vectors. The presence of multiple links on disposable hosting suggests a link farm used for SEO poisoning or to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=acsm+exercise+physiologist+exam+study+guide In PDF document text
    • https://xapotaligefako.weebly.com/uploads/1/3/4/6/134612972/7439650.pdfIn PDF document text
    • https://bezoduremudopez.weebly.com/uploads/1/3/1/4/131437412/49d5a0ec80e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374380/normal_5f8d755374300.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/5ec37e0c5b884a.pdfIn PDF document text
    • https://nujamoxe.weebly.com/uploads/1/3/4/2/134234607/rerunovoxowe.pdfIn PDF document text
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/25c984.pdfIn PDF document text
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/kolapotug.pdfIn PDF document text
    • https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/baxasuwok.pdfIn PDF document text
    • https://sabidodavo.weebly.com/uploads/1/3/1/4/131408103/pepetorokelop-rojekadiraludo-kokofo-vedajekemode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370266/normal_5f88f183a0122.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382958/normal_5f933bab66545.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/mutirexa/69947027368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc7a6d4a-c5bc-496a-ab51-bab0d2d80d93/la_division_de_la_fisica.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
    • https://www.brainscape.com/subjectIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61AA 5424 bytes
SHA-256: c8418c07729c9a3b4f8a4f36c7fcc0efefda7684fa128c4aafeed1699badd771
font_01_sfnt_off0000741d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x741D 11668 bytes
SHA-256: b5fbe063a8dc9b5c653ddd8a6e4f2a5843f798afe4dad660d61d7a65c06f7ae9
font_02_sfnt_off00009b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B34 16396 bytes
SHA-256: cac455e2405841eafc36aab02eb9cf7a84e700146dc283a7b224059cbaed9ddf
font_03_sfnt_off0000b0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E7 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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