Malicious PDF — malware analysis report

Static analysis result for SHA-256 97dee23e330b8708…

MALICIOUS

PDF

79.0 KB Created: 2021-03-07 09:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8239247efcdc51cdf1d64d050a633e3c SHA-1: 113c731701af608f7475b82ceafda2b0a489d708 SHA-256: 97dee23e330b87085be44ee9703abc07b2787a566451ce3fc995500fd610153e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate that the primary purpose is to redirect users to potentially harmful external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=organizacion+de+una+empresa+constructora+peque%25C3%25B1a
    • https://cdn.sqhk.co/jitolado/xji71ge/gartner_magic_quadrant_siem_2019.pdf
    • https://cdn.sqhk.co/zarepowake/bkhdxMr/oscar_fish_size_growth.pdf
    • https://cdn.sqhk.co/lebogomatoze/niv2Ric/81951627172.pdf
    • https://cdn.sqhk.co/butuxolevu/NjiiejI/watarakizadax.pdf
    • https://cdn.sqhk.co/wojipezusax/8QXcKhe/razawuzivefomudo.pdf
    • https://cdn.sqhk.co/perokokamosa/ggI6ihZ/48957882260.pdf
    • https://cdn.sqhk.co/linewebozid/jbjfwyl/black_music_player_pro_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_8fdfe0564e9f404dae0201eafa069825.pdf?index=true
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_3e477884a72a487b9415bd4dc3ce0321.pdf?index=true
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_e234541724d740dd90da2f2c9e134019.pdf?index=true
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_d23d63eec9924e65a2c5d664b03fde93.pdf?index=true
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_ac2c31e902f04d13a731f14e107f9013.pdf?index=true
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_07266f199d874dea8e8f41e748f47a86.pdf?index=true
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_9c2479653fa247ad95f416093f6f1f4e.pdf?index=true
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_bc7b346f3db14fcf84f118c9bf5728ab.pdf?index=true
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_8d9dd1746e44491d8e7cc1e5300cea15.pdf?index=true
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_f2fd064cbe6d448ca15098cbe06ab793.pdf?index=true
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_2d7949a3a3ca4aa9a1c0b6f34dfe5474.pdf?index=true
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_e7b37ee4947b45929e6626951de41281.pdf?index=true
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_673fe5a095e8405c8f5b5bd29d9fedd4.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f36c.bin
0aa90aef0254eb2321eb6886d0d63d8f9dd1b86202efb0a74d92f99cf7d545b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF36C 5776 bytes
font_01_sfnt_off000106ba.bin
330b1503f8150ed1bdd540d9d4729f14cf27ccd50541f5bd099d9ba3c0a666fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106BA 11372 bytes

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