Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b68e83c1222e116…

MALICIOUS

PDF

69.3 KB Created: 2021-01-29 12:11:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6c5e2b0235c7bf7c4691f5c6be1aac8c SHA-1: 27ae6dd524b1b05348e18579ece1277c13854403 SHA-256: 2b68e83c1222e1165baf34f8224134d45c6ea5b418792919c00868ee86d5b33b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to obscure the final malicious destination. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggests a phishing or malware distribution attempt.

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://baarspo.ru/aws?utm_term=english+words+meaning+pdf PDF link annotation
    • https://cdn.sqhk.co/kelopifagisu/gjjfDie/odds_to_win_2021_college_football_championship.pdfIn PDF document text
    • https://sutoxozugunewu.weebly.com/uploads/1/3/4/7/134768558/rutoxizufilemejilaxe.pdfIn PDF document text
    • https://pusiruse.weebly.com/uploads/1/3/4/7/134717846/7557628.pdfIn PDF document text
    • http://servicesforsupport.com/fivipemomirilotew2u5cl.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxesojogugu/hajg1AZ/top_hashtags_on_instagram_for_artists.pdfIn PDF document text
    • http://nazulemijoxamif.iblogger.org/case_information_sheet_tarrant_county.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409123/normal_5fc8929424b8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447630/normal_5ff6954e6a241.pdfIn PDF document text
    • http://italy50wow.pro/manual_del_aprendiz_de_cocinerolbcs3.pdfIn PDF document text
    • https://xefanopebowemid.weebly.com/uploads/1/3/2/6/132681782/7069782.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jedejetitafabi.rf.gd/dog_adoption_paperwork_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/44566938045.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/57376833218.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_off0000d20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20B 5504 bytes
SHA-256: c5182ef503e70551369362e719b94b065c1d820c12da6fedbe1c8f9b38a491e2
font_01_sfnt_off0000e4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 10732 bytes
SHA-256: 652bd13da2ff6375bb27b22e51b71b0ca43f22876a2b3f8463a8094c551c29da

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