Malicious PDF — malware analysis report

Static analysis result for SHA-256 adac42b79eeedb17…

MALICIOUS

PDF

69.6 KB Created: 2020-12-16 23:49:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2099a69ae17b052537787c6770b4269a SHA-1: 19dc4ba5084e0b6ee0db7ad78ab83a2c0f40bde8 SHA-256: adac42b79eeedb17786accc5f4558568c05930c1dd91f9fac1ab1caa2ed67563
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier further support the malicious nature of this PDF, likely used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/123?utm_term=7+rings+chords+guitar
    • https://kizozejibudi.weebly.com/uploads/1/3/4/4/134460324/7c49f.pdf
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/721a1237e3.pdf
    • https://cdn-cms.f-static.net/uploads/4471948/normal_5fb3e859c875b.pdf
    • https://nasoxuxelaleve.weebly.com/uploads/1/3/4/7/134744481/b82e721863.pdf
    • https://gazewowotom.weebly.com/uploads/1/3/4/6/134616189/295eccca78.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc19cf9bdb33045eec75325/t/5fd19183ebc7ce75e8ac2b79/1607569796000/nokexibenil.pdf
    • https://static1.squarespace.com/static/5fc4d1c52cf09257bd84ca4b/t/5fcb5b2b9cf56e0e8b1025a5/1607162668079/top_ten_anime_comebacks.pdf
    • https://static1.squarespace.com/static/5fc72731eddbb05c6893b1dd/t/5fc7912c48d5672cfb42fa06/1606914349721/.pdf
    • https://s3.amazonaws.com/robumuduluwise/quartz_hill_elementary_school_supply_list.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf351b7ee8e70759d8266/1606218577630/nepuweje.pdf
    • https://static1.squarespace.com/static/5fc2a60b1c8c7413143d24fc/t/5fc386d8145a8629dc1df64e/1606649560589/iron_law_of_wages_marx.pdf
    • https://static1.squarespace.com/static/5fc2b9942e537a05ef14dfe3/t/5fc39e803485235c8635eb14/1606655617517/19455510637.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc25.bin
53059198eaff0fb3a6fa6773b34f3236936ed3d2a644539a38794b394949fef1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC25 5152 bytes
font_01_sfnt_off0000dda8.bin
f84c819a86e2a4800afeb76664d4ad4d996d5d00bfcdd0d5b047ec523b3b572e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA8 13688 bytes

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