Malicious PDF — malware analysis report

Static analysis result for SHA-256 584ca61c57e368bc…

MALICIOUS

PDF

77.5 KB Created: 2021-09-19 05:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 200d6b253c0b0486e5c6767d3508b42f SHA-1: d7378861d5af426a0cfbd4283139ac0c6246417f SHA-256: 584ca61c57e368bc3a126519c755e2c974781aff8a75fd47b742b6b03c28504e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chcial.ru/uplcv?utm_term=jinde+meriye+full+movie+watch+online+hd PDF link annotation
    • https://szabobuszrendeles.hu/files/files/47533446049.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/9013201973.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/56502050134.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/70105728356.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210915_220159.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/xoxulikugeluvi.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/61543184432.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/velativefanuv.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/34747279383.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/kijisijugezunu.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/18489702538.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/nutaditateradazuw.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/53949553082.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/delokudesujide.pdfIn PDF document text
    • http://sinostandards.net/upload/files/konozub.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/64040521915.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090405295973499.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/vuvadetuled.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/64571956749.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/68679653061.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/58423390290.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/54974620343.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/20360717747.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/medaze.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/vapofojuruk.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_off0000ca2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE242 10932 bytes
SHA-256: 9667c8d1559518eddae2ecd238e791a6a29f2945a858c19c622e716db7912b74
font_02_sfnt_off0000fb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6D 17460 bytes
SHA-256: b3ab439518da31d25c6caf2ed2fee713a3fdc91adab31f5f9e06b1b1d406ede7

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