Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53e136a60949f22…

MALICIOUS

PDF

88.6 KB Created: 2021-02-18 21:00:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1831388dd951fa8ea7b052fce7f791e3 SHA-1: c7b29e8d5c60ff9452515cd4e2d5624cc0793ad6 SHA-256: e53e136a60949f2267f11d22b3ceffc9b9c71826c169821582ea1b12fb7bffc4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs suggests it is designed to redirect users to potentially harmful content or exploit kits. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wix?keyword=eg+civic+auto+to+manual+swap PDF link annotation
    • https://cdn.sqhk.co/biloriput/fghDVhd/black_desert_mobile_tamer_skill_build.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/4ifW9gj/wepetavubuxeku.pdfIn PDF document text
    • https://cdn.sqhk.co/bevizewo/ehdkut2/vugina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_6027cb8dbc5f4.pdfIn PDF document text
    • https://jutemutugitut.weebly.com/uploads/1/3/4/6/134617260/5557492.pdfIn PDF document text
    • https://peturenu.weebly.com/uploads/1/3/4/4/134401199/wozudilefagadu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390055/normal_6027ac44233b1.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/hibQ01M/chocolate_covered_strawberry_mousse_cake_recipe.pdfIn PDF document text
    • https://cdn.sqhk.co/dujagazatad/B6ijixH/last_stickman_battle_royale_mod_apk_unlimited_money.pdfIn PDF document text
    • https://kexejimeso.weebly.com/uploads/1/3/4/0/134096016/b6e2a.pdfIn PDF document text
    • https://febefadu.weebly.com/uploads/1/3/1/4/131453100/rurafabipipag_dabupi_sodinekil_geramuloxid.pdfIn PDF document text
    • https://jagefebasedi.weebly.com/uploads/1/3/5/9/135993187/8107652.pdfIn PDF document text
    • https://gibejuta.weebly.com/uploads/1/3/0/7/130776113/f70a5606f3.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/sijhdYG/piclab_photo_editor_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/hbghjij/54882999455.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/hef0jgy/zekovumukalegepema.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383138/normal_5ff1676906b82.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/jezobasit/bike_games_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/bahubali_2_video_song_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/lomux.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/livegewukorazilefini.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_off00011edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDD 5264 bytes
SHA-256: 96e48f57c546058bbb0d3e8da2befaefdda63da426b40943a7019dd46c993a66
font_01_sfnt_off000130dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DD 10564 bytes
SHA-256: 21f2c5151dd5f738f7291a150b32b705f3d726baa4471cac4469353cc56a2dc4

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