Malicious PDF — malware analysis report

Static analysis result for SHA-256 b341076c2538ee13…

MALICIOUS

PDF

81.2 KB Created: 2021-03-27 17:43:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1688d09b0e4a069e09ac3a154d2419e4 SHA-1: 405ba3ad938129d562cc1289bcbe18c02e1c7676 SHA-256: b341076c2538ee1302bd18bca766e1563ced35885dced1458d9afbecb5e8ee86
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with a significant number pointing to potentially malicious or unknown domains, suggesting it's part of a link farm or phishing campaign. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document's purpose is to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/award?keyword=uncitral+arbitration+rules+2020+pdf
    • https://neloramobipetez.weebly.com/uploads/1/3/1/4/131407165/45e021db2ccaeb.pdf
    • https://poxesaxe.weebly.com/uploads/1/3/0/7/130738711/xujotuw.pdf
    • https://cdn-cms.f-static.net/uploads/4366385/normal_6049ecbbd1470.pdf
    • https://nodararikerat.weebly.com/uploads/1/3/4/8/134885074/vaporonisu_dolivojol_mofevonak.pdf
    • https://cdn-cms.f-static.net/uploads/4500183/normal_5fd2f20370d0a.pdf
    • https://bokowamimufap.weebly.com/uploads/1/3/2/7/132712050/zexip.pdf
    • https://vatosulutat.weebly.com/uploads/1/3/4/5/134587817/zekizoguboxipe.pdf
    • https://cdn-cms.f-static.net/uploads/4490256/normal_604fc4f273830.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bulolimepol/the_evolution_of_democracy_the_birth_of_political_parties_worksheet_answers.pdf
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_bdfff98fac77459e807c512c40f8c244.pdf?index=true
    • https://s3.amazonaws.com/mufukep/surviving_sepsis_campaign_guidelines_2017.pdf
    • https://229c0a76-8cd2-4a6d-ad64-a548a1436bbb.filesusr.com/ugd/f9ed01_7a187a34185749d18c973cc903f74131.pdf?index=true
    • https://s3.amazonaws.com/gajabedafot/64866336122.pdf
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_0b1b2a125e5843a5950b119296b8bfc4.pdf?index=true
    • https://s3.amazonaws.com/tutasujal/vofujokud.pdf
    • https://s3.amazonaws.com/wufujudisu/62492567585.pdf
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_702c8b351dfb4ebc835f730c6dc9066c.pdf?index=true
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_5e29b96ddb3f45d7bd6a6d733f44b41d.pdf?index=true
    • https://s3.amazonaws.com/firudegix/zozoj.pdf
    • https://s3.amazonaws.com/zarusegibitumet/wiposeziligiludozugusober.pdf
    • https://s3.amazonaws.com/gumagabu/how_does_the_flame_work_on_an_electric_fireplace.pdf
    • https://s3.amazonaws.com/gozilum/what_words_describe_family.pdf
    • https://s3.amazonaws.com/rivazixexuguri/linear_and_nonlinear_functions_worksheet_kuta.pdf
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_483f5e37fc7547cda381b7b98a3e422b.pdf?index=true
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_56adb8ef468f42718ca85d2332aad8dc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f385.bin
901c9feaf48b638295efd2ab9a5c21f1fd0de140dd9b13a6e48122575f588380		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 5436 bytes
font_01_sfnt_off000105fa.bin
591626205ac3c9cb418526afc49074ba58b59276838d323d1149c926c1b36b21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 10300 bytes
font_02_sfnt_off00012939.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12939 4324 bytes

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