Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3aad2bf92c91149…

MALICIOUS

PDF

85.6 KB Created: 2021-03-05 07:45:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5d8e4af4fc73f3dd611f359e288ee777 SHA-1: 10995b71c3b705c04a6cb41831b53cc652420926 SHA-256: e3aad2bf92c91149c12416cc3ecadc6909b5ce4e876d5f75a9c0c2454345257b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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.
  • 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/award?keyword=data+center+manager+jobs+in+canada PDF link annotation
    • https://cdn.sqhk.co/zidenesek/hEiD5Dd/don_t_starve_shipwrecked_dry_season.pdfIn PDF document text
    • http://sopisafexuj.sportsontheweb.net/5934719403.pdfIn PDF document text
    • http://xagugudel.sportsontheweb.net/rotodenowomadumuzetop.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/iaJghij/blood_glory_mod_apk_revdl.pdfIn PDF document text
    • http://nipizakevenuvis.scienceontheweb.net/what_is_the_best_rental_carpet_steam_cleaner.pdfIn PDF document text
    • https://cdn.sqhk.co/rivojotewez/dgijjtc/call_of_mini_zombies_2_hacked_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/hgdkhdB/18930505081.pdfIn PDF document text
    • https://cdn.sqhk.co/dudavizi/fgIUlhg/59046715421.pdfIn PDF document text
    • http://fubikopelemom.mypressonline.com/patezerinabi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_b3d9bbc583c449bbad509d40a7440c3b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/92279345013.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_d227ff8331144d9b83db819141774d97.pdf?index=trueIn PDF document text
    • http://segurixuzek.myartsonline.com/all_souls_day_2020_images_download.pdfIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_a58f6710079c4fc7a534266493d1bdff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pilazi/frescobaldi_sheet_music.pdfIn PDF document text
    • http://taguloxutenafol.myartsonline.com/93417542553.pdfIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_fe0ac08e565548c68b6b06ff67694992.pdf?index=trueIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_1be0195cac704af2a3dec629229bc020.pdf?index=trueIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_d6a322d35aef43ee8681ac9cbbdb1ecb.pdf?index=trueIn PDF document text
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_2f38eebc1c4f4e54821f3cb2a1116950.pdf?index=trueIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_5e8ce09531b841798d47ff60fac9432b.pdf?index=trueIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_1ad00737fab548dd8acca6e63eadeaf5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/answer_to_impossible_quiz_2_number_53.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_8ef9ee6c01fc48518f25fccc00929645.pdf?index=trueIn 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_off00011240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11240 5440 bytes
SHA-256: 7f2ce2b7adbceae9d0ce1fbbc12c292c72bbe65434c4a8b1ab6c40103a9e7521
font_01_sfnt_off000124ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AE 10412 bytes
SHA-256: 85ecd8a6db2cf7afe067c6f2cbe290385bebbed821bdda891df4a0d675d4f300

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