Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd2f92866dda8ca7…

MALICIOUS

PDF

83.6 KB Created: 2021-04-02 07:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 06ef17bc681377b1b6445908e2eea995 SHA-1: 8aa82e8d42264e5877c40749607715d4829d2065 SHA-256: bd2f92866dda8ca77b5de1806c219e0db597293a2a65cb27b8ddc52b3af3afe2
126 Risk Score

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 0.9954

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=cracked+vpn+apk PDF link annotation
    • http://natbeach.space/zelda_botw_dlc_1_guideyeini.pdfIn PDF document text
    • http://lbaranaydin.com/midland_walkie_talkie_gxt1000gkl8t9.pdfIn PDF document text
    • http://snegny.com/how_to_do_3_to_1_ratio_in_cupsu8u9p.pdfIn PDF document text
    • https://cdn.sqhk.co/fikalibumi/aKPjgJQ/klingande_jubel_alto_sax_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/iajb1hg/images_of_cosmos_flower_pictures.pdfIn PDF document text
    • http://bumaga.bz/honeywell_focuspro_6000_thermostat_installation_instructionsj0lf2.pdfIn PDF document text
    • https://cdn.sqhk.co/bujavenizake/L7UjaZp/15685158459.pdfIn PDF document text
    • http://hookup154.fun/my_stella_knights_guider8i2c.pdfIn PDF document text
    • http://copyrights-notices-helps.com/66341969776whtwy.pdfIn PDF document text
    • http://simultaneously.space/travel_tourism_competitiveness_report_201678osg.pdfIn PDF document text
    • https://cdn.sqhk.co/xekufaledu/jiicgiH/converse_platform_sneakers_canada.pdfIn PDF document text
    • http://mikrotikwizard.com/bidixagolimubl6r1j.pdfIn PDF document text
    • http://fullstacket.online/dns_server_clash_of_clansox252.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/Ycij3gf/digital_marketing_strategy_course_london.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
    • http://jixuzijufemufil.rf.gd/amendments_of_bangladesh_constitution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a81520-f453-4383-b998-c20d7e54f4d1/85955292249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88971f35-2404-4175-ac5c-01ea4f0c1407/cooks_illustrated_dry_brine_turkey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a11ca5e-2c2c-4b7d-92d8-7fbdf97f369d/90391707009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ace512-89b7-4c6a-a8bf-ccf4a6ed2884/buvazerum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b862e827-7109-41d4-b1d4-37c8919cf6d7/47494300752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bbf0a77-19eb-4f51-baed-529e8ac3d276/91148268900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74b6f28c-0e2b-4f58-93c2-57346cbba02a/what_is_mathematics_really.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/989929a9-bd14-40d0-b4e1-13ac6439729e/calculator_canon_p170-dh_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e199b4a-0f92-4786-9b2d-040e2e4c2a60/first_grade_math_worksheets_free.pdfIn PDF document text
    • http://wesofidufu.rf.gd/balun_canan_rosario_castellanos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9915aae8-6f4b-4a6b-afa2-b716e0d520df/can_you_blog_on_wix.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_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 4556 bytes
SHA-256: 7d88b6266de9f6b004bd30fdf2a6e592a7a32298f139e93b265dd90ac08e23df
font_01_sfnt_off0001038c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 21068 bytes
SHA-256: e5bf78d1e364578e9452e2cd27932ede1f3a69c3d52b0c765c6759a66a68dfa0
font_02_sfnt_off00013325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13325 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e