Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10f0dd219c444a1…

MALICIOUS

PDF

72.2 KB Created: 2021-02-15 15:09:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 53c20753b3a8ad9c0d8a232cba52fd77 SHA-1: 17d62fbc7bf0181f3f26d9638be94beca2043e8f SHA-256: b10f0dd219c444a1260128201b7284a505da82cc507b907bba4b5b10872c0aec
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the lure-based attack pattern.

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 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://jacksth.ru/wix?keyword=bca+high+school+math+team PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4394060/normal_5fd3b99b04830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499283/normal_5fe873c637f4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378846/normal_5ffeb2fb9ccc2.pdfIn PDF document text
    • http://pelistens.xyz/wowudoviwujezulurujade58nxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447084/normal_5ff1c4e1bf585.pdfIn PDF document text
    • http://silver35.ru/mofavadetogemoteritefefwgppu.pdfIn PDF document text
    • https://rowiteruna.weebly.com/uploads/1/3/4/4/134470704/2754529.pdfIn PDF document text
    • https://tikedamo.weebly.com/uploads/1/3/1/4/131453682/zasakevaxamel-giluko-tedaxemevubosan.pdfIn PDF document text
    • https://vidiwubiref.weebly.com/uploads/1/3/0/8/130874646/2f888.pdfIn PDF document text
    • http://daating19.site/ard_live_stream_zdf_livestream76pmz.pdfIn PDF document text
    • http://hyipinvest.site/boi_bella_vision_2020_musicyjpup.pdfIn PDF document text
    • https://pibefugaradaxo.weebly.com/uploads/1/3/1/3/131398186/7601668.pdfIn PDF document text
    • http://pinerapidsrr.com/experimental_design_of_a_controlled_experiment_worksheetmy8rd.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/kovezodepugov/vepofijevuzejesis.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/cassandra_database_for_windows.pdfIn PDF document text
    • http://sexosur.epizy.com/7586662973.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_off0000de97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE97 5164 bytes
SHA-256: ad4af92db68460424bb0d334b016063d07fe769dce506d2c8326e4cdf8115f1c
font_01_sfnt_off0000f007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 10636 bytes
SHA-256: 6ef017ec49b26787d2ec043984531174e545823acd5e43c7fc8e60ef770134f7

Open this report in the interactive analyzer, or submit your own file for analysis.