Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f6b2d920e98d28…

MALICIOUS

PDF

69.6 KB Created: 2021-05-12 23:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be88accf59c8ba2f1680990f66bdd3e2 SHA-1: ae893f44ee818ff82b3b0bddaf14f6d8a513d70f SHA-256: a6f6b2d920e98d28ee21801561df8679017d1acb9e0f526e2aaec57c89cf11e1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of external links and the PDF structure indicate a likely attempt to exploit users through redirection, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=short+stories+in+spanish+with+english+translation
    • http://bepumekelu.22web.org/58028609733.pdf
    • https://viwejabaru.weebly.com/uploads/1/3/4/7/134749074/binelar.pdf
    • https://fologonalufofu.weebly.com/uploads/1/3/4/6/134694067/1406366.pdf
    • http://help-feedback-amzn6.xyz/75144970357hfpy3.pdf
    • https://lekorasosin.weebly.com/uploads/1/3/4/6/134612915/93ea18bd.pdf
    • http://pugajuxo.iblogger.org/70182480899.pdf
    • http://my-credit.info/thus_spoke_zarathustra_best_translationtrtox.pdf
    • https://wupugilitem.weebly.com/uploads/1/3/6/0/136020535/mulokezuregogarogaka.pdf
    • https://fuwodeku.weebly.com/uploads/1/3/6/0/136095673/fa384f1823db.pdf
    • http://pumujavebedopa.iblogger.org/667534256.pdf
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/bapugekozomasumik.pdf
    • http://lovechat24.club/23067282735ljuo8.pdf
    • https://tawedituja.weebly.com/uploads/1/3/4/8/134864040/pawutemokeridinev.pdf
    • https://guzajemifuraruv.weebly.com/uploads/1/3/0/8/130874286/jaxokususapeli-firejobigog-lanujulovezoka-minopidivenur.pdf
    • http://sitajejo.22web.org/zalofanulen.pdf
    • http://biribekagupelu.66ghz.com/72019005665.pdf
    • http://lnstagramsupportlives.com/vopelituxakefaas3.pdf
    • https://nomabedipami.weebly.com/uploads/1/3/1/4/131437379/4358191.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_22a8fdb2d3ad469ba530a1f3b664bcca.pdf?index=true
    • http://xekipeme.rf.gd/java_tutorial_oracle_docs.pdf
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_33b6c2ae265441588384db206a8de4a4.pdf?index=true
    • http://zuxulabawiba.rf.gd/penigejubetasexizile.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_off0000cfe6.bin
a57ab556fb18955ed3140d6b803a4d61fbc1df730ddb8f09233df705bea65f1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE6 5276 bytes
font_01_sfnt_off0000e1e2.bin
1ef96b73d1721892a965c3d678113eda1f135ccc31dd4b046c5a3aff21d0299b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E2 11100 bytes

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