Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d79498c46d38ce…

MALICIOUS

PDF

112.7 KB Created: 2021-03-24 16:49:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7c9a8fe4921b3f6ea73c034b4a74712f SHA-1: aeed713764a5e4840aea51d20c9eeeb46001a87c SHA-256: 81d79498c46d38ce50dd0286d40f76fa97f08b467f4060ae76f05d1b9b7472a1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

Heuristics 5

  • 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.
  • 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/123?utm_term=aw2518hf+firmware+updater.+exe PDF link annotation
    • https://cdn.sqhk.co/nujekezitifi/kp0geBA/hidden_agenda_ps4_game.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/9heOqMg/64233836754.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/zifhbUd/phone_tracker_app_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/sezunofubuzi/vjeijjc/nanerubegipopi.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/cgfhgjn/xagoxif.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/GGiiicl/race_racing_car_drawing.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/CtgeAkE/xujugu.pdfIn PDF document text
    • http://goxadonivibifiw.22web.org/xeletagulilevinujepok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_b62674a8f12049809a743801d118af7e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3fcdace-5a7a-4f51-8046-18f11f0f7507/an_nawawi_40_hadith_arabic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dea87a46-52b5-4644-85f3-ce536ee14341/18725692745.pdfIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_ee4e459abd0047719b7f9be156bee4dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19281eb3-b732-42d2-8bd6-728d89f5ba29/37509223588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cf9ab21-7cb0-4209-832e-b206be93b18d/how_to_teach_grade_1_students.pdfIn PDF document text
    • http://disefubukub.rf.gd/airport_city_airline_tycoon_mod_apk.pdfIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_221246a41ad446629ef40a94c3da7e14.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f9db735-14f8-4a7e-b516-b5884eaebe2a/how_to_factory_reset_asus_tm-ac1900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c020216f-45b6-418b-a01f-f2419768d55d/can_a_cracked_windshield_pass_inspection_in_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf1876b1-888c-4aa6-a97e-936108c30c7f/kenmore_portable_air_conditioner_instruction_manual.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E02 5756 bytes
SHA-256: e6b0e5f5db68434a87ee385fb8834396bcbe149ca643fbd5efbe5070652ee974
font_01_sfnt_off000171a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171A0 14084 bytes
SHA-256: 2beaede48a9d9662bda5e444dab202f9553a4769d83e30cc52f635c560801947
font_02_sfnt_off0001a06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A06C 16088 bytes
SHA-256: 945115f6d333aac916ca78a4c87a19dd4828aa1f4d182cf1da7e5c9030963f60

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