Malicious PDF — malware analysis report

Static analysis result for SHA-256 c006e9d880f9a447…

MALICIOUS

PDF

72.8 KB Created: 2021-01-21 16:01:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8dfa6216131fea116baeb808c2111f50 SHA-1: 56bf6c5210498b3153c59d32474b3fb72b60f227 SHA-256: c006e9d880f9a447b00c47c11834cb73fcf3bb5f7ccd227dca2b6952097f5e35
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, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various Weebly and other domains. One of these links, 'https://baarspo.ru/123?utm_term=should+i+have+crutches+for+a+sprained+ankle', is directly embedded in the document's URI. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/123?utm_term=should+i+have+crutches+for+a+sprained+ankle PDF link annotation
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/nuniror.pdfIn PDF document text
    • https://guzaxogovi.weebly.com/uploads/1/3/4/6/134651677/9067155.pdfIn PDF document text
    • https://luboguti.weebly.com/uploads/1/3/0/7/130739177/0fe0dac3a3.pdfIn PDF document text
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/9bfa26d.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/k6NPii1/43621708851.pdfIn PDF document text
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/xiwokupujila_bafaf_josimudizebu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375207/normal_5fa53fb457fff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451930/normal_5fca5103b154c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lunojol/7483905576.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/halloween_word_search_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/justice_league_dark_animated_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/virodu.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_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 5468 bytes
SHA-256: f5270552865af497ca7b6b4b0debd214f9f78a150463460ede364e4f4d53b0fb
font_01_sfnt_off0000f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 10072 bytes
SHA-256: 42b0dd22076c3899cff9ccc3a5887ecae7a8ac9720fcb46fc01569e3197571fb

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