Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e222d8f90bd75a3…

MALICIOUS

PDF

88.5 KB Created: 2021-04-07 21:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea94129eb1d13148ea7e55de278bcb78 SHA-1: 814d05dbbccf7c79c9b81b806f78f4a96a4124a3 SHA-256: 4e222d8f90bd75a3130d991cfdb75158883e9336b9cb316f698a4e2bd174087f
156 Risk Score

Malware Insights

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

The PDF file contains multiple external links, including one that appears to be a search result for 'Arma 3 helicopter controls hotas', suggesting a phishing or SEO poisoning lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=arma+3+helicopter+controls+hotas
    • http://sovisuxabubete.22web.org/sjogren_s_syndrome_2020.pdf
    • https://static.s123-cdn-static.com/uploads/4414489/normal_5fe04e8c59b07.pdf
    • https://cdn-cms.f-static.net/uploads/4456989/normal_6033c60d708a3.pdf
    • http://kowuterada.mygamesonline.org/27192212081.pdf
    • http://fitotim.iblogger.org/45562731954.pdf
    • http://sakulog.sportsontheweb.net/school_calendar_2020_uganda.pdf
    • https://static.s123-cdn-static.com/uploads/4387807/normal_6000948c548cd.pdf
    • https://cdn-cms.f-static.net/uploads/4379233/normal_606d8f47c84eb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://5e7fdb44-65a6-4d88-9b36-b69c04d36e08.filesusr.com/ugd/b547b4_78c14234ebcd406b9d63e43c12df1e25.pdf?index=true
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_e6a236d4f85747e7bba87d141b1aa119.pdf?index=true
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_c6540e9546304cec81b75018a6ff48dd.pdf?index=true
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_554d7331504049a085a43dac4917a9b7.pdf?index=true
    • http://xonadisusuvav.epizy.com/zemilevelomagoxexomuwoxow.pdf
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_945ee7a035f9420c80ee3dc84ecd41e5.pdf?index=true
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_376a7fa2e8be458a9c5fb09a1604f990.pdf?index=true
    • https://901b9152-9067-49c5-8541-bb90c1a77dfa.filesusr.com/ugd/5d84e8_b6cd3e382d28467aa84a1377991695f5.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_off00010f88.bin
ed789fc3b1a8aa7427fb0ae2cdd26787942dedc58d8518751333c7f4272b2d95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F88 5112 bytes
font_01_sfnt_off000120a7.bin
feb5ffee3540c24baf419b86d4688043dc6474be5a810f08b209184b8030a12b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120A7 11164 bytes
font_02_sfnt_off000146a9.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146A9 4324 bytes

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