Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0bd98c4ea8bb44…

MALICIOUS

PDF

99.9 KB Created: 2021-05-04 06:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c0ef18da06d98b9034e9c1c3410962d4 SHA-1: 518028d850d15925dd1690736caadc90143247db SHA-256: fd0bd98c4ea8bb44692659f0bc5f445e27caa2f2c3a7889d862b16b4935f6198
186 Risk Score

Malware Insights

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

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 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=what+countries+did+the+iron+curtain+divide PDF link annotation
    • http://tublitalia.space/zojujosedidolmhb.pdfIn PDF document text
    • https://cdn.sqhk.co/lebapivi/he59hck/ice_cream_maker_cuisinart_ice_30bc.pdfIn PDF document text
    • https://vepegusekukoj.weebly.com/uploads/1/3/4/4/134470637/teratimanoz_zugil.pdfIn PDF document text
    • https://mamaganonofob.weebly.com/uploads/1/3/4/6/134602085/buxisuwapiso.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/184dRhf/odd_eyes_rebellion_dragon_overlord_deck.pdfIn PDF document text
    • http://werenntaq.online/free_printable_atomic_habits_worksheetsa0joc.pdfIn PDF document text
    • http://my-favshopd.online/fofarufetagguvp.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwinoxaxava/AgnzXie/wifemaleruposefivab.pdfIn PDF document text
    • http://nibelv.xyz/66128960124rm3ob.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/7CGVGjh/line_graph_calculator_for_inequalities.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/hbSeChg/free_file_sync_windows_server_2012.pdfIn PDF document text
    • http://gprofights.ru/apex_launcher_classicuztl2.pdfIn PDF document text
    • https://kobamaputoruv.weebly.com/uploads/1/3/1/4/131409310/4078777.pdfIn PDF document text
    • https://wopokajam.weebly.com/uploads/1/3/0/8/130874492/belerezopuleg.pdfIn PDF document text
    • https://zarimuxeve.weebly.com/uploads/1/3/4/8/134897304/gumipewatugemuk.pdfIn PDF document text
    • https://weruvuwixaxo.weebly.com/uploads/1/3/5/9/135972833/8904488.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://s3.amazonaws.com/jajuzasalikirut/kumexizisewenutivegifime.pdfIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_d78f448d4f69449abec0762bc8ecc6ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setikizo/79611842747.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/lobegogidula.pdfIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_c9d4c645fdd44a5891d9d280b999f0e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sisaxu/gatikunanifevepijudizer.pdfIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_5a722fceac6e48e8ab50b7b159380a58.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sewamos/jamutababobejogudo.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 6416 bytes
SHA-256: 528d1e79c27aec131c2cbf846536b85f4c117e3725d0fa982f5a85159cdab222
font_01_sfnt_off000102e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E3 4952 bytes
SHA-256: d93370c2465f0fa05378ba4ca5be66dcb589d41c555600eff9eaebfcace5498b
font_02_sfnt_off000113a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A8 9360 bytes
SHA-256: 11e8bbae0d25a5992ab2d73e62dc19c13705ad5c967050c3f6583a82a8866f78
font_03_sfnt_off000131a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A2 10764 bytes
SHA-256: 209e716f30bbc8783d9e77f30447e094bd63c867cdd692044d89c0011fb6b016
font_04_sfnt_off000156b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B7 16256 bytes
SHA-256: 8cc6bcc2cf3defe0a88aedbd81e1c3d6ddceaf294630c8a268e5b6d92b2eedfb
font_05_sfnt_off00016c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C25 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
font_06_sfnt_off000179d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179D8 1736 bytes
SHA-256: 0d9b6ab0354368cdfa5a4e52e4dfb250ede80cec4283e48fafec0a3c1c1d30df

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