Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a02c8d08fc592b…

MALICIOUS

PDF

81.7 KB Created: 2021-03-24 15:31:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 695093a830a5385ba84b053e5e900e6e SHA-1: 751badca7e95c876479e5d1f4fbac8a16973c2e2 SHA-256: 84a02c8d08fc592be0282404b1ae8396d78a08706748f1cf07b3581783d5e8be
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to direct users to multiple PDF documents. The document body, though heavily obfuscated, suggests a lure related to practice tests. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/wix?keyword=bio+keystone+practice+test+with+answers
    • http://tuderoba.getenjoyment.net/68818289950.pdf
    • http://kixuredatuzafu.22web.org/appstorevn_cho_samsung.pdf
    • https://lutaxebibutemun.weebly.com/uploads/1/3/1/3/131380730/c6b2ab1a2c8c6.pdf
    • https://rapalavosifezo.weebly.com/uploads/1/3/4/8/134886177/jeraletabiwegero.pdf
    • https://fazebepipetuko.weebly.com/uploads/1/3/1/3/131384618/gomezamesebon.pdf
    • https://barurusijibipek.weebly.com/uploads/1/3/0/7/130740419/lozanelakale.pdf
    • http://vibolofisef.mywebcommunity.org/how_to_clean_kenmore_front_load_washer.pdf
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/rebufoneneseke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fisulefajow/bedsheet_design_names.pdf
    • https://s3.amazonaws.com/xisakazelelinim/15154602971.pdf
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_3b8b40e93d4e429087aaba4672e6e6d8.pdf?index=true
    • http://kutavezof.epizy.com/finilo.pdf
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_86c3c4023d194f71a934cce6edbb9ddc.pdf?index=true
    • http://mawabubobiniz.rf.gd/graphing_quadratic_functions_word_problems_worksheet.pdf
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_56d92e4871e94270a6ffa19731869622.pdf?index=true
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_03da43bc7400413d9d80edaf4b9f8c13.pdf?index=true
    • http://livirava.atwebpages.com/90736957106.pdf
    • https://s3.amazonaws.com/xukirizugukugi/luxury_brands_fight_list_answers.pdf
    • http://vekamujibatebig.rf.gd/zodet.pdf
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_78cb5b38240041e78ce683a63ae58dee.pdf?index=true
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_42cd68dd9a7c4fd8bd38c4d3d059232c.pdf?index=true
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_05fb8598669b4f56bf4f20d18192341b.pdf?index=true
    • https://770603ce-cae8-48b7-b4e8-6e15b9dac1cd.filesusr.com/ugd/e975af_67fc184ed6774fe3b079ba554316f850.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb42.bin
a76c038bb12e67a07ba2b3c3baa604e7757eb01166299ecfb8b1c4d034d6cc21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB42 5296 bytes
font_01_sfnt_off0000fd60.bin
f3b52a99a4b6f8acef750906869e35f5d66f4aa09892a6bb11a7bc4336f15a4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD60 10612 bytes
font_02_sfnt_off00012206.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12206 16204 bytes

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