Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c62dd1f29de4d43…

MALICIOUS

PDF

80.5 KB Created: 2021-03-17 13:27:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d9ba78ccd527ae9e4c8cc971e7a6fc9 SHA-1: 7efc1fd15c7ce820ed2fdd6a7b98f390dcd285a0 SHA-256: 6c62dd1f29de4d432ece7ba5a22c23d330cd9b0858b5620c2906e22cd6333629
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one prominent URL pointing to 'kuzutuzo.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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/wix?keyword=hello+kitty+chainstitch+sewing+machine+instruction+manual
    • https://cdn-cms.f-static.net/uploads/4373782/normal_604e6a1ddb895.pdf
    • https://nosozekime.weebly.com/uploads/1/3/4/6/134634018/faxudikasiteliz.pdf
    • https://rowafitiw.weebly.com/uploads/1/3/4/6/134608100/womisalovog.pdf
    • https://nejavedejelije.weebly.com/uploads/1/3/4/3/134336697/4063473.pdf
    • https://cdn-cms.f-static.net/uploads/4421613/normal_603f0e85dcc94.pdf
    • https://cdn-cms.f-static.net/uploads/4450147/normal_60244f9f9844b.pdf
    • https://cdn-cms.f-static.net/uploads/4481056/normal_601b46a3a0da5.pdf
    • https://wazalopa.weebly.com/uploads/1/3/0/8/130814586/zukokeluseworiz_lozemipene_naludadedolazu.pdf
    • https://kulojimafad.weebly.com/uploads/1/3/4/5/134518235/a0b7ac13.pdf
    • https://static.s123-cdn-static.com/uploads/4368474/normal_5fdfade69daa3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7cb65c63-1dce-4e70-8639-52a4c2578171/xabebemobojopujezenaz.pdf
    • https://uploads.strikinglycdn.com/files/d8248a58-d133-45bb-abca-bb036aff1fdb/foxam.pdf
    • https://s3.amazonaws.com/sobaketemu/repobarari.pdf
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_d4970b4c709e49c58ca425cffa3661ce.pdf?index=true
    • https://s3.amazonaws.com/nolarifaforuxop/thyroid_body_type_diet.pdf
    • https://uploads.strikinglycdn.com/files/a80cc1e2-b463-49d4-9afd-30ef1e0b51fb/an_acres_of_diamonds_lyrics_and_chords.pdf
    • https://uploads.strikinglycdn.com/files/22aaafae-69f6-47dd-9b6c-e53ba6b5a873/what_are_some_fun_quiz_questions_to_the_impossible.pdf
    • https://s3.amazonaws.com/nafibanefexex/kaxit.pdf
    • https://uploads.strikinglycdn.com/files/edf093c9-de09-4d50-8018-cf6ffae62c9f/wusixofaz.pdf
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_6144b596f3f14e51b6864c8dacd96775.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a4f4e657-8337-4aa6-9972-45488127544f/jack_lalanne_juicer_cleaning_instructions.pdf
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_65162431248f4d08a4279e045603a778.pdf?index=true
    • https://uploads.strikinglycdn.com/files/de9a1bf2-207f-4778-8f52-c6b01fc55d6e/digital_signal_processing_book.pdf
    • https://s3.amazonaws.com/sulasatevirexo/76885101106.pdf
    • https://uploads.strikinglycdn.com/files/746fb064-aad2-499d-bffe-93ec50f0ba34/34632077117.pdf
    • https://s3.amazonaws.com/fajeloninesitel/18432587369.pdf
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_a0ce25e85e664964a3ddc06047c7cab5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7c0d2b76-b78f-46a5-a4ff-a1aa5f000f9c/9345850405.pdf
    • 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_off0000f8fe.bin
a1040573c0f88114043bffd7af9fd64cb3b5719f91cdf8cead1fd507b7739e6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 5432 bytes
font_01_sfnt_off00010b64.bin
57a0154ff0d8c4515ace9dca1552b43431990940545bcde9f2e5d7d2d6e2c831		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 12336 bytes

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