Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e404b8010e8769…

MALICIOUS

PDF

68.5 KB Created: 2021-01-13 22:26:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 771a2e36ffd91719aa12f3340a067ede SHA-1: 12bd83c45f5c766d3abd004f1540c1c055ba5985 SHA-256: b4e404b8010e87697b0caf03f5ad4d525027d59c9a1b817511e0341000489c23
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate an attempt to redirect users to malicious sites.

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 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.
  • 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://trafftec.ru/123?utm_term=basic+transport+phenomena+in+biomedical+engineering+fournier+pdf PDF link annotation
    • https://site-1172428.mozfiles.com/files/1172428/blue_cross_blue_shield_florida_claims_address.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476758/normal_5fb4b1d31c838.pdfIn PDF document text
    • https://site-1172792.mozfiles.com/files/1172792/good_healthy_takeout_near_me.pdfIn PDF document text
    • https://site-1178419.mozfiles.com/files/1178419/90315921741.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f8711132fe72.pdfIn PDF document text
    • https://site-1178309.mozfiles.com/files/1178309/wolidokikubepoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379385/normal_5f94148607514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369329/normal_5f91e7ededc07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421205/normal_5fd093b86c015.pdfIn PDF document text
    • https://site-1171689.mozfiles.com/files/1171689/sepsis_3_guidelines_2017.pdfIn PDF document text
    • https://site-1173983.mozfiles.com/files/1173983/the_siren_voice_on_head_scp.pdfIn PDF document text
    • https://site-1166710.mozfiles.com/files/1166710/buzuwejalinovo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482002/normal_5fcad6cb81e21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447669/normal_5fce6b15080c3.pdfIn PDF document text
    • https://site-1168038.mozfiles.com/files/1168038/pinball_games_free_download_for_windows_7.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
    • 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_off0000c0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D9 5640 bytes
SHA-256: a1a516aa1bf27668ce3db4a701b0ebe95bbb9365cdd70e69d09bc513c433a621
font_01_sfnt_off0000d3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C9 10120 bytes
SHA-256: a67a688619c7e57ae7f91c3aa86ba5417f5a0a54b6e8b597676d68c8c00b6734
font_02_sfnt_off0000f657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF657 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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