Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cffa0f44a0151a1…

MALICIOUS

PDF

77.6 KB Created: 2021-04-02 18:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89833ca426c8f4b75d1be0802ffaf90c SHA-1: 068d85a3b03e4e7347adeed071572c24dccd5433 SHA-256: 8cffa0f44a0151a18719e2c9c19989e2ddc38a32f2d2a47dbbdde6a9db6ec316
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, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it's part of a link farm or a distribution mechanism for phishing or spam content. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document's purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://kuzutuzo.ru/strik?utm_term=lasko+fan+maintenance
    • https://cdn.sqhk.co/penunotati/1hfichf/subway_franchise_cost_uk.pdf
    • https://cdn.sqhk.co/wamemalifu/jiYpiav/banquet_event_order_format.pdf
    • https://cdn.sqhk.co/rewazexi/ghb8Mie/70275995137.pdf
    • https://cdn.sqhk.co/vulovosovem/fqgdjco/53129424033.pdf
    • https://cdn.sqhk.co/merabuvi/gOjirhb/mint_launcher_dark_mode.pdf
    • https://cdn.sqhk.co/zimuteraf/eIJa3YU/xerosexurilijanaduder.pdf
    • https://cdn.sqhk.co/mujekesire/glhhigI/lisuworubetu.pdf
    • https://cdn.sqhk.co/lakanodip/gCgdhc6/13022876469.pdf
    • https://cdn.sqhk.co/wafexumu/z4chfhh/clown_neighbor_granny_escape.pdf
    • https://cdn.sqhk.co/lajoroteb/hjAhdGm/anthem_lights_in_christ_alone_free.pdf
    • https://cdn.sqhk.co/jawadagive/LdeicOi/bahubali_full_movie_1080p_bluray.pdf
    • https://cdn.sqhk.co/xurokagozagu/g6HrOBN/video_calling_app_android_studio.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b7fe7bbf-bf27-47e4-8a27-42c152b345b2/is_there_a_sequel_to_scarlett.pdf
    • https://uploads.strikinglycdn.com/files/258107c5-4ff5-441d-a174-ca776c04951b/18455428840.pdf
    • https://uploads.strikinglycdn.com/files/ddc9dca0-03b9-4cc3-a4d9-206f8cec58b1/talodinowalikiladuxekowuj.pdf
    • https://uploads.strikinglycdn.com/files/2a64f828-434f-483a-93f9-7a60512a3ede/30194427664.pdf
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_eb445ac952ee4abca0f90c57fbf69c9b.pdf?index=true
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_aa009e0614df41b8b1dac595e8cdf789.pdf?index=true
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_036dfc9923014f5ea54c609166b97956.pdf?index=true
    • https://uploads.strikinglycdn.com/files/191daf6d-9763-481d-9d13-cc79168bc734/67240112282.pdf
    • https://uploads.strikinglycdn.com/files/3e9045e9-3f4b-4f38-bef5-b7c614aa7bbb/giwowe.pdf
    • https://uploads.strikinglycdn.com/files/b56cd424-286f-414c-bfcf-c35ce4cb69eb/wedogusiwisuwefefira.pdf
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_9091b2d95c55424c9681b4d4a0ea0ee2.pdf?index=true
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_879b2e54b4d7478a86088678cd707482.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c7992111-46c6-43f5-85f3-98e996f118ec/the_lying_game_season_3_full_episodes.pdf
    • https://uploads.strikinglycdn.com/files/d260a449-7a3f-4783-b47e-066209d69183/25163738161.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_off0000f2b1.bin
b7696f4934cabe6d0ac1c857dcd5eeb7cfb61d7d435193ac3c788d4d819fd3d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 4904 bytes
font_01_sfnt_off00010360.bin
ba3acd72fd06e36affcb43797c42191dd851e71048f964f6a129239599290d17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10360 10984 bytes

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