Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2601eb2b016e703…

MALICIOUS

PDF

75.7 KB Created: 2021-04-03 06:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8eaa391eee631927aadf29657caf2f4a SHA-1: 5c34fa7e99b7617070274d0260f1243bf52bb540 SHA-256: c2601eb2b016e703c12e964b0a9edbd150dd6113d55aba9f62aac070c12dd381
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to improve search engine rankings, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malicious content via the embedded URLs. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/award?keyword=convert+pdf+em+word+online+i+love+pdf
    • http://texoraw.sportsontheweb.net/c_objective_type_questions_and_answers.pdf
    • http://ig-copyrightnoticehelp.com/mobarupubete0gyaf.pdf
    • http://selizixid.iblogger.org/simple_addition_worksheets_fun.pdf
    • http://zitosuganenat.medianewsonline.com/kupojusegulipesuzusamiwo.pdf
    • http://jajokojunewi.mypressonline.com/tadipesopuninarozujube.pdf
    • http://naderuromopuru.22web.org/pdf_to_word_converter_free_download_full_version_filehippo.pdf
    • http://pazujiz.mygamesonline.org/eichmann_em_jerusalm_download.pdf
    • http://czecheducation.space/8405193851bpaxk.pdf
    • http://airbin.top/neo_geo_cd_bios_downloadui3rl.pdf
    • http://marketitaly.info/89010125653owwxf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_d3411e3766c34b02928dd9deaf035f74.pdf?index=true
    • https://67536400-2f23-40e2-9d3a-36ae3f4dfb8c.filesusr.com/ugd/5312ea_8f0654c72aa448fdbe6c1fe45077467a.pdf?index=true
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_4421f606e7a546e98a3e7fb005bf8ce0.pdf?index=true
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_d05743ad2c0e48f0a5fe72aa7210ed8d.pdf?index=true
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_7033789cbec54c00928e570b45113e31.pdf?index=true
    • https://s3.amazonaws.com/jowutoneranemuk/51129496855.pdf
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_300697ef348646fa9678c2fcc3692255.pdf?index=true
    • https://s3.amazonaws.com/baposivarabuj/jutezemevijebagobon.pdf
    • https://s3.amazonaws.com/jarawaxanivu/wpf_expander_template_example.pdf
    • http://wufikemofumop.atwebpages.com/revafisakirego.pdf
    • https://s3.amazonaws.com/donake/osrs_bandos_trio_guide.pdf
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_2e2dec1b9797469aada13631ade934f2.pdf?index=true
    • https://d848e4b6-662b-4424-a759-963270729452.filesusr.com/ugd/30e015_f1a8696101884e579ba4f6743e76061c.pdf?index=true
    • http://bavematokej.rf.gd/durorupodikapifuno.pdf
    • http://gigezevozaf.epizy.com/ragopomowopurutilejej.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_off0000e9d8.bin
bc9b08d7d1c5fb60e39fc0a4351e0e062e0da0a23e9222a688af8b3c6dc7df76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 4856 bytes
font_01_sfnt_off0000fa5d.bin
f35d17cd67ee3330644fba41505a5006ab61dcf5f49ee170bf94302cf1dded48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5D 11592 bytes

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