Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc336c1f16ee4ee8…

MALICIOUS

PDF

84.1 KB Created: 2021-09-21 17:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e9190c75cb64d4c5d320dbde97a3a3ae SHA-1: 311ed1beb57431e043914099795a553913d6e243 SHA-256: cc336c1f16ee4ee82ea8c376159b1343667ebc503fa9186d3074c26686c07f3a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm used for phishing or distributing further payloads. The PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://academiapreprod.riportico.com/userfiles/files/bifekepuruzezupige.pdf In PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/jofezozuvikaxobijuwobig.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/vuwevotapusulik.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/gepopusugebaturekudewatej.pdfIn PDF document text
    • https://fong-cai.com/upload/files/93629096954.pdfIn PDF document text
    • http://duef.ru/public/file/96852358433.pdfIn PDF document text
    • https://bfull.ru/uploads/files/sizipatarokoz.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/dakafepigesabijegukudil.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/02f19288c11cc0fb72c63f4d9f360f0c/bibivotiwekulavuzugi.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/25692720798.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/77523590472.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/wukizugijudoz.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/74736628813.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/17883198016.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/35157795790.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/35828169475.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/10578111334.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/39894865738.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-2/20210902151723133397.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/3ccd4bffde1q4464e72d1tp2fq/63667073031.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/tukofek.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/bibotusobidiz.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/74249064055.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/24535704115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=application+tablette+samsung+galaxyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE001 11052 bytes
SHA-256: f27948b417d850d945dde19b4aa49be92aa9c5da4a6c3d6bd88dfb6ed01a742d
font_01_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 18864 bytes
SHA-256: ec14b6ae18232744fb2f0834230d5dcdbc2004473522be4174e826c64837474e
font_02_sfnt_off00012a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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