Malicious PDF — malware analysis report

Static analysis result for SHA-256 615b2ed25d9e682f…

MALICIOUS

PDF

81.0 KB Created: 2021-03-02 13:45:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2dedd50b42431b949f0436e1649ea66a SHA-1: 034ab31c7ff77a7ebe513cf51c06f54f9a8444cb SHA-256: 615b2ed25d9e682f50a402e1c399b9057a92e006dbff5531dc4cabeb2a11864c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The document appears to be a link farm designed for SEO poisoning, directing users to various suspicious URLs under the guise of providing study guide answers. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://kuzutuzo.ru/wix?keyword=chapter+10+study+guide+the+periodic+table+answers PDF link annotation
    • https://wujumumokujot.weebly.com/uploads/1/3/4/6/134613036/betapowi.pdfIn PDF document text
    • http://ig-socialmedia.xyz/alphazero_chess_openingsdgqvh.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/hghghhf/tezukiregixelafi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413846/normal_5fdb748171dbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421062/normal_5feda7a157010.pdfIn PDF document text
    • http://autokenn.com/414908333692xbpz.pdfIn PDF document text
    • http://sale50.pro/gegimegonunixapoponuril3rq5.pdfIn PDF document text
    • https://fipamowusaki.weebly.com/uploads/1/3/4/8/134879766/nolitukaz.pdfIn PDF document text
    • http://nesobaka3.xyz/tebavedanusudaeotk6.pdfIn PDF document text
    • https://lutafutenitar.weebly.com/uploads/1/3/4/3/134381418/sodozuvenujekudenim.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/ijhhrge/tycoon_business_schools.pdfIn PDF document text
    • http://euromarket.pro/what_do_you_understand_by_logic_of_deterrenceacfiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503390/normal_600c5884cc01e.pdfIn PDF document text
    • http://naturebiolog.fun/whatsapp_free_download_for_android_2.3.3mxjwc.pdfIn PDF document text
    • https://jefanumu.weebly.com/uploads/1/3/4/8/134889008/2582924.pdfIn PDF document text
    • http://pasetbs.xyz/11249788817wkm92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451955/normal_5fc8478063168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_6033d57c112d5.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/sesijesule/jitibizoke.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 5768 bytes
SHA-256: ffc0e0979dc11c6b3656ead297b8f09aae4b4cdb6c4aae7306da5589d47cd578
font_01_sfnt_off000103b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B1 10908 bytes
SHA-256: 6a4ccf0969db67b9658c4a922c6cefdb289c78c4df806c0122303f5a3621f8ff
font_02_sfnt_off00012879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12879 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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