Malicious PDF — malware analysis report

Static analysis result for SHA-256 3938f396a8ceeb0b…

MALICIOUS

PDF

98.1 KB Created: 2021-03-02 13:59:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ac48eec81b94fd77ad9b0826a58d20c SHA-1: 27af76759b9570aa90c0c4e56b922471661cc53c SHA-256: 3938f396a8ceeb0b8171005928e2f81b10843974b3166aa25f0e05aaeef44dcd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a link farm containing numerous external PDF links. The embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to the 'kalam cosmological argument', likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/123?utm_term=why+the+kalam+cosmological+argument+fails
    • http://rexonina.medianewsonline.com/62303960603.pdf
    • https://pinipinemijik.weebly.com/uploads/1/3/0/8/130814728/ledomijakupadukisu.pdf
    • https://cdn.sqhk.co/tixunudixa/ihvchcZ/spongebob_movie_game_sponge_on_the_run_free.pdf
    • https://static.s123-cdn-static.com/uploads/4495265/normal_6006e3d5bce7e.pdf
    • https://burevojaziji.weebly.com/uploads/1/3/4/7/134729690/2164850.pdf
    • https://cdn.sqhk.co/nilesatu/eIZialW/vevawufesubejozuzije.pdf
    • https://cdn-cms.f-static.net/uploads/4494893/normal_601bb909b6c73.pdf
    • https://cdn.sqhk.co/dixejetafap/hjB0jeU/run_device_manager_as_admin_command_prompt.pdf
    • https://borerejo.weebly.com/uploads/1/3/4/0/134040615/37c086aa40a.pdf
    • http://50offstore.pro/coinium_isotopes_of_atoms_answershrjlq.pdf
    • https://tepojaja.weebly.com/uploads/1/3/5/9/135966759/7857714.pdf
    • https://static.s123-cdn-static.com/uploads/4469370/normal_60051fd378841.pdf
    • http://velesvoyage.ru/foam_sheet_art_projects1n6z9.pdf
    • http://spoonnumberone.xyz/trane_xe90_furnace_pressure_switch_errorn3hi8.pdf
    • https://tevupuzenoxa.weebly.com/uploads/1/3/6/0/136009769/4a0269.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00014061.bin
7217bbf24bf32e8b0ba1cf3913d5b3b638e253fdfc9a71b3999e79415161dde2
pdf-font-stream PDF embedded font (sfnt) at offset 0x14061 5472 bytes
font_01_sfnt_off000152ea.bin
010473a1961005afe250405ece7c4180ba49edf56f1590b4a4783f0db10f6197
pdf-font-stream PDF embedded font (sfnt) at offset 0x152EA 12780 bytes