Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c8b58883926620…

MALICIOUS

PDF

82.8 KB Created: 2021-09-22 16:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6fc92cdf33e73c4be26633367dec58da SHA-1: 21f464d38cfa86400b31f867d24f9e1d3812a3f8 SHA-256: e9c8b588839266201c0351dceffae5ac94b80aea53768a1ed8c447db07f8d64a
134 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs pointing to suspicious domains, suggesting an attempt to redirect users to malicious content or phishing sites. The PDF structure and embedded links indicate a likely spearphishing attachment used to deliver a payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=pok%C3%A9mon+go+mod+apk PDF link annotation
    • http://masterref.ru/editorfiles/file/89769070423.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/12049084251.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/5982110382.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/28069831241.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/5611234274.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/gafupe.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/piduxidamerakuxusuvar.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/89938134592.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/94505609277.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/4abed5e5a877827732d2d829046e37d6/81348786323.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/58522011489.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/kogawomudubolu.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/gegaboxedibasefelutep.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/13756057366.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/19467767507.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/11293223079.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/tugebasow.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/jitureriwanadezonaje.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/dilaxubodegodana.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/72182536951.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/37669178837.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/62497841890.pdfIn PDF document text
    • 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_off0000dc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 18632 bytes
SHA-256: ecfe02021f03799caec511d928c8a7b585d5ebb0d5d41fe99e62c51683888ccd
font_02_sfnt_off000124b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B2 10348 bytes
SHA-256: d58262f0fa2e2817d6b7a00d91569f77abc54b14e25ca64edd2671d4fbd3c718

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