Malicious PDF — malware analysis report

Static analysis result for SHA-256 229c75efe8782030…

MALICIOUS

PDF

75.1 KB Created: 2021-04-27 02:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e1a1d3ced35f2aef2f99cd9fff19a29b SHA-1: 25ab4fb2c6ce2543a981321645324a6fafdacfd5 SHA-256: 229c75efe8782030dec67dff4fa96b83617014e23ceca80d6ed0a8e27bcaa6cd
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable hosting and utilize UTM parameters, indicating a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious. The primary external URL identified is likely part of this scheme, aiming to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://seumenha.ru/strik?utm_term=workpro+quantum+9000+series+ergonomic+mesh+mid-back+chair PDF link annotation
    • http://all-gopro.com/flow_free_apple_store4vxwv.pdfIn PDF document text
    • https://cdn.sqhk.co/rijatazuga/fPhjihG/what_time_does_nascar_race_tomorrow.pdfIn PDF document text
    • https://cdn.sqhk.co/favosejo/TghbVgl/pong_table_painting_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosewude/dnhjgdz/farming_usa_2_money_cheats.pdfIn PDF document text
    • http://bella24.xyz/436538879434f194.pdfIn PDF document text
    • https://cdn.sqhk.co/sozonexof/ilbEieo/consumer_reports_car_seat_covers.pdfIn PDF document text
    • http://roskycnmx.com/12645946927ifsfn.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/xopefilutigafonopop9vt8a.pdfIn PDF document text
    • http://remont-pc.website/decimal_tenths_number_line_worksheetswi0gk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kisagoz/insinkerator_evolution_spacesaver_xp_vs_compact.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/636307e8-8c70-46ed-8d70-31099470ac40/mipulefekilivaj.pdfIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_9c348901d6584505a0f7de79de7e609f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/32589445733.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/autocad_2010_xforce.pdfIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_301e8394ef6f44e4af373048da9ce763.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca93a28a-40bc-4c8e-92eb-7dd222c8c58b/kisoduzinetojuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cc87f5e-f7f4-474a-bc5f-95ebe42e784d/88759862964.pdfIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_a6e9dddce56444a3896ea0e9b3a4a5ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec5a1b05-18a8-4342-ae08-ab8df5506d8b/28364281121.pdfIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_6460353446c5439f97bf79c19986490e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wegugus/diziler_formlleri.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/gowurumejuxawunudorenip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f5cfd60-4788-4942-9959-2164deef5c38/6.0_powerstroke_egr_bypass_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c36069f-803b-43ce-b6a5-bbfe653da490/rumuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ab81a3-b002-4cac-ba11-193665a625f5/shell_scripting_tutorial_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddfbc90d-007c-4f8b-93b5-e22df2b4b96e/what_is_point_of_view_in_literature_examples.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 6128 bytes
SHA-256: 8c779e5582efc12fab344d1a973e53e494d370ccd955ed58b6d945282a6309dd
font_01_sfnt_off0000f61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 11736 bytes
SHA-256: d15abc626eedcc546cc06573f809ffd07ed332d30ae389897de1494788af9133