Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd8438ec6c517ca…

MALICIOUS

PDF

79.1 KB Created: 2021-04-08 06:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2c381e1641c30fbaeadda21054eed4f7 SHA-1: bb2917dea338975b0cf154349ef0aba725a78016 SHA-256: 8bd8438ec6c517cae7a56653c37dd59e878bb8997928ed424ceeefc4e6e4fde8
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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

  • 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://jumiwimov.ru/strik?utm_term=propresenter+6+stage+display+not+working PDF link annotation
    • https://cdn.sqhk.co/reditifotep/jjdOhjg/28225605892.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/ZK2ig7k/english_learning_games_for_high_school.pdfIn PDF document text
    • http://uscreditmonitoring.info/42981468771wd3d2.pdfIn PDF document text
    • http://clebohets.xyz/6233210734uuy2j.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/ig1PaH5/bass_booster_eq_music_player_pro_apk.pdfIn PDF document text
    • http://dsv-trening.ru/chitta_veet_baljit_songd993t.pdfIn PDF document text
    • http://zumbayuliya.online/how_many_types_of_safety_belts_are_theretkcdm.pdfIn PDF document text
    • http://erethiztzj.space/doubt_a_parable_essayyo1mj.pdfIn PDF document text
    • http://pycnidwzxc.info/20272112802wzjzr.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://curvepreloved.com/pimuzowevx8onw.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://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_65a485ac527f436db36f1ea02b6a156a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/093fb6c7-8b66-4046-9ef0-fddd8a98c873/buvij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edba9b6f-aef5-4280-a20c-d20aaa21dd32/stihl_bg55_carburetor_part_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85549105-91e4-46b0-8437-7256df70049a/24005250359.pdfIn PDF document text
    • https://be8414c4-f2d5-40c6-b8a8-1a5561a1dac7.filesusr.com/ugd/a452ea_1735fc347f6e4dcc9aee4a6295d39609.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_817b184e1a0143c68db3d315b8d7ed2e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2a3ba0e-8337-4c4d-aa34-fe44f29f21e6/toyota_highlander_hybrid_tow_package.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8921fdbc-71d4-4fc3-83f8-0eeed7f34d78/john_deere_z425_hydraulic_pump.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b18f3c99-af29-40a6-b6b5-11d7a2533725/tozodiva.pdfIn PDF document text
    • https://3789e5f8-265e-48cd-8836-241a044b7ceb.filesusr.com/ugd/45ef7e_6f01dc0407a14ac89f3a8338e67c55a8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 5328 bytes
SHA-256: b778feaf65f75b3dfa33d149a395744bd994f26677728815c066d9b771c5b7d0
font_01_sfnt_off0000fca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 10548 bytes
SHA-256: bf237dd1855f2438e293fa7c849bbddeb26904385c4bc3cc09acba68081b0e35
font_02_sfnt_off000120c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C4 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3