Malicious PDF — malware analysis report

Static analysis result for SHA-256 99df1794bc12a9e2…

MALICIOUS

PDF

95.8 KB Created: 2021-03-07 22:51:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3e939fdb73eb72c3f8f663d4136d89fd SHA-1: 6c88d98d01e3eb7afa6141e7537fa38fab6ca8f7 SHA-256: 99df1794bc12a9e2708c4363010976915bbb445b21f3f9aa49e0730a35719837
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The sample also exhibits characteristics of a link farm hosted on disposable domains, suggesting an attempt to obscure the final destination of the user's click. The primary malicious activity observed is the redirection to external URLs, likely to facilitate phishing or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wb?keyword=quicksilver%203000%20throttle%20control%20diagram In PDF document text
    • https://cdn.sqhk.co/vovewotutal/ejdmie9/ninja_games_play_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455659/normal_601614ec10834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449395/normal_6029f29c45feb.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/Qiehiib/xikonajifo.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/GhjxOjS/business_international_machines_logo.pdfIn PDF document text
    • http://kuxufijum.iblogger.org/65701015219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448330/normal_6043e49b85bd5.pdfIn PDF document text
    • https://cdn.sqhk.co/mojekuvugise/fvlHRjf/big_battle_3d_mod.pdfIn PDF document text
    • http://verezitabel.66ghz.com/going_on_a_bear_hunt_activity_sheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406241/normal_5fc6c27d5ccf8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465930/normal_5ff466af9d0fb.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/jjhdBhh/incremental_definition_larousse.pdfIn PDF document text
    • https://cdn.sqhk.co/dejowipapoli/oiijgax/69866179104.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_92cc5568660a43498bb00a06054d5a24.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0d237f4-6112-4535-b960-c5014e7acae0/garmin_astro_220_extended_range_antenna.pdfIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_f08b9ec354434bf685fbf791ad6f3ba7.pdf?index=trueIn PDF document text
    • http://damufabenipete.rf.gd/a_short_guide_to_writing_about_film_9th_edition_free.pdfIn PDF document text
    • http://kudovumajumiw.rf.gd/android_convert_r._string_to_charsequence.pdfIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_ef7445ba6c2b4ca895555397af6245f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b010417-5637-4f2d-b51a-5468d434d94e/75423244987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/201fa737-5ce4-42c6-9d8c-76227e016c7a/how_much_maserati_granturismo_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2db38af9-9d00-42b2-a0c9-239cb5a2e23f/66169268235.pdfIn PDF document text
    • http://zexolida.rf.gd/lego_warhammer_40k_dreadnought_instructions.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013a74.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13A74 29448 bytes
SHA-256: 8eb475aa71386631ce59bf0a122b50d49a14aa32ba28ecd3258d06b91e30dbbc
font_00_sfnt_off0000fc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 5844 bytes
SHA-256: 0f2dfd1c9787501e9528edd7f98c22e8f543d25d5b74787752b9f8a7eccb9409
font_01_sfnt_off00010ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFB 13136 bytes
SHA-256: d06348bfa78ffff7f8f841541830078749cc1a669e11762a2d4db92f837f62b9

Open this report in the interactive analyzer, or submit your own file for analysis.