Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47de9c13a238867…

MALICIOUS

PDF

77.7 KB Created: 2021-03-18 02:19:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2207430b63fc206e705f9229d69205a0 SHA-1: 6fe1978ba70807bd1fac107aac930df827ae12dc SHA-256: c47de9c13a238867170e6d61554480d7dc412ed134f281aef49478bcbc60ead4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with one prominent URL being `https://kuzutuzo.ru/strik?utm_term=lake+cumberland+poker+run+2021+dates`. The presence of a link farm suggests an attempt to manipulate search engine results or direct users to potentially malicious sites. No scripts were extracted, but the PDF structure itself is indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://kuzutuzo.ru/strik?utm_term=lake+cumberland+poker+run+2021+dates PDF link annotation
    • https://cdn.sqhk.co/puwupasakej/c8djdji/free_mobile_recharge_app_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/i7sidhi/venmo_paypal_apple_pay.pdfIn PDF document text
    • https://cdn.sqhk.co/tivanosox/jgcgjLP/2648683423.pdfIn PDF document text
    • https://cdn.sqhk.co/jesuzedavoti/hjdgiiZ/tezuramikovamej.pdfIn PDF document text
    • https://cdn.sqhk.co/luginuwi/erNy3ij/grammar_exercise_determiners_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/rodofusavivi/igcMsvU/igo_navigation_android_sd_card.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/JgfFVGg/doremidiweguvor.pdfIn PDF document text
    • https://cdn.sqhk.co/bemememu/pnnKjd6/46200015523.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_67485f35306147b2a7ac09cf0cac012c.pdf?index=trueIn PDF document text
    • http://gadazowowotogug.rf.gd/toredajusuluwemefu.pdfIn PDF document text
    • http://zokitidekav.epizy.com/59177139335.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_7ec71ea749234941bae679e758c66308.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/messenger_lite_android_requirements.pdfIn PDF document text
    • http://birifamabaxum.rf.gd/sonikesafeduzonipigenamu.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_1da678ad3d604796b1277c481d09717e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/akira_manga_full.pdfIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_deaecaf5d1854b8ba0fe9529d0d39060.pdf?index=trueIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_8e4e25ebd378487c95c44faa71b87d1b.pdf?index=trueIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_14ab537ce1734de9a07843a2a7708982.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/why_is_my_nail_gun_not_firing.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_59a917856f234e5e8b7711b09267e773.pdf?index=trueIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_29d291bb9c194fcb84d4696b17f5df34.pdf?index=trueIn PDF document text
    • http://lanakupi.epizy.com/flowers_for_algernon_theme_song.pdfIn PDF document text
    • http://sikamavidasatam.epizy.com/55869072710.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/big_book_of_nursery_rhymes.pdfIn PDF document text
    • https://0ca12155-7937-4926-a9d0-23a43aecd1f4.filesusr.com/ugd/d55797_efd678e58cfe4578a99cff1f30a4d473.pdf?index=trueIn 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_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 5688 bytes
SHA-256: 9529045fa1e34fb9ecd0da91c98d3f5252abad70795b4493c2855a0dc704fba5
font_01_sfnt_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 10944 bytes
SHA-256: 2e1d16846c41b221035d10bd01f01ae858e58250ba9420fef6ea820277369c22

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