Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef64702794cf35a7…

MALICIOUS

PDF

69.5 KB Created: 2021-03-22 01:25:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2516ee60552ecf9b40e9d421681b4527 SHA-1: bc2b6e8f469abb1f37c6a09941780dd8280d8770 SHA-256: ef64702794cf35a7e82db0f9eb2feaaa0535dae2a8bee0f3d56517604a8957e0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, with one pointing to 'mezovuduw.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to an 'answer key', reinforcing the lure. No scripts were extracted, but the presence of embedded URLs and the overall heuristic firings indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/wix?keyword=section+2.1+matter+answer+key
    • https://cdn.sqhk.co/modajili/hihghg4/a_short_history_of_ancient_greece.pdf
    • https://cdn.sqhk.co/mamevugixej/UifbA7E/68174806640.pdf
    • https://cdn.sqhk.co/nuwezomu/gioRhaM/dejuzo.pdf
    • https://cdn.sqhk.co/sijaxovada/djhMje2/danesojixugojilo.pdf
    • https://cdn.sqhk.co/punipopi/cGfjdjb/best_way_to_start_own_kingdom_bannerlord.pdf
    • https://cdn.sqhk.co/pewesopefim/igm2Mjj/mirage_memorial_global_tier_list.pdf
    • https://cdn.sqhk.co/ropikenetu/jgihcSK/bunoguzakobugamoxu.pdf
    • https://cdn.sqhk.co/naxupowu/hkjdibn/bulokos.pdf
    • https://cdn.sqhk.co/zijigemeworu/chehghj/toxojobam.pdf
    • https://cdn.sqhk.co/zunezafi/a4whjhc/perfect_form_jump_shot_basketball.pdf
    • https://cdn.sqhk.co/wirowanorax/Z7JIVwl/dota_underlords_rank_list.pdf
    • https://cdn.sqhk.co/wefonasifaza/fvTTsl5/batejijobifetis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/94e816d0-721f-4023-9e11-df32b4c5d501/safikubibebapudije.pdf
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_4394112136064b3d89924d24c7ae2722.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d8f2eeed-ac6d-4a6c-aa4c-98a1ea4be3b5/the_mortal_instruments_city_of_bones.pdf
    • https://uploads.strikinglycdn.com/files/6827af8e-a482-47eb-be90-4f1d466f4dc6/94265292323.pdf
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_42a12d9d4aca48e8a201335a184bf41a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/905b9f86-a896-4ff0-a2eb-de20b9228099/how_to_reset_a_samsung_soundbar.pdf
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_d492fa87f90842b1aa7fb3b6a149bd4d.pdf?index=true
    • https://0aa989e7-076c-475f-bc22-fff5ae310860.filesusr.com/ugd/b44be6_fcd6f5c4aed84341802dcaf0710ba20a.pdf?index=true
    • 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_off0000d316.bin
7e2d5aba96456d1839887f92716898ded95e24d64332ca54aee75b956ba39aea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD316 5488 bytes
font_01_sfnt_off0000e5d3.bin
646c870994c2b81fb70c42d46626d7660fd6df9482a91c07bbf02a4957019bbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D3 10384 bytes

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