Malicious PDF — malware analysis report

Static analysis result for SHA-256 7766b85acd7e7f4a…

MALICIOUS

PDF

88.6 KB Created: 2021-03-17 06:34:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 995c2ab8894857567f8e7a5db1a8114f SHA-1: b62fb47d8711a5a9a151a1a513de08223a97b0c8 SHA-256: 7766b85acd7e7f4a3d033bed31738d179325f57dec7d01fee097e437bf641cb6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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 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://zajinet.ru/123?utm_term=audio+recorder+android+terbaik PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482869/normal_5fcc0c3f3edc7.pdfIn PDF document text
    • https://cdn.sqhk.co/xafemepino/j7WVjft/mancala_game_2_player.pdfIn PDF document text
    • http://gbarb.me/87775517495meyth.pdfIn PDF document text
    • http://uspex22.online/xofogegulifl9cg2.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/ifgigia/munezulidav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465267/normal_6033600899d03.pdfIn PDF document text
    • http://cadenalia.com/guide_for_ice_scream_horror_scaryrl01t.pdfIn PDF document text
    • http://firstsecu-paypal.com/executive_order_6102_effectbimh1.pdfIn PDF document text
    • http://ampinternational.org/51872016708akge4.pdfIn PDF document text
    • http://osummer.space/fmcg_industry_project_report9zuzb.pdfIn PDF document text
    • https://cdn.sqhk.co/wowasuperan/ijdFrhl/73582522627.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/ggggjSZ/ninja_air_fryer_walmart.pdfIn PDF document text
    • http://negozio50sconto.info/how_to_connect_krk_rokit_5_to_focusriteyu1dn.pdfIn PDF document text
    • http://qwertyujg.xyz/sri_lakshmi_sahasranama_stotram_in_teluguxfesg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420037/normal_60379a8381306.pdfIn PDF document text
    • http://topshops.website/mixed_factoring_practice_worksheet_algebra_1whlt0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/28104a6b-3c7f-48c3-a867-31511caaa6f7/tipos_de_funciones_en_las_matematicas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55b3349f-8254-4972-a0c4-2d6e2d63c030/matthew_hussey_love_coach.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a191b3d-fdb3-4f79-9895-f58d7717b6aa/miwatinijerepafoname.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d925112-a313-4b23-a09b-dd430ebf4874/jeep_cherokee_transmission_repair_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e351fe38-5323-45f7-8c03-01d9ecfa1d45/97970003785.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11033 4796 bytes
SHA-256: e1955007287f8d765f174a02c6a2a88adf8f5dd90e10b52b073d633e9974d3d4
font_01_sfnt_off00012089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12089 11384 bytes
SHA-256: e65c937705c166801faaee7f6f8a74f7845425b0489c10884eecfbb9c6c86053
font_02_sfnt_off0001471d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471D 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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