Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea5b4947943e51d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 14:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd70c58409a242a92c1b2938bceb7311 SHA-1: d0c8ff6ab155c82a74148dbd4c58ee97a0148b47 SHA-256: bea5b4947943e51d64032a5d01ea30e53fb0d8ecf483a9e02a797efce95dc06b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The PDF also hosts a large number of external links, many pointing to disposable domains, indicating a potential phishing or link-farming scheme designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/sajodadibubogusod.pdf In PDF document text
    • https://mvmdigital.gr/files/files/50684939050.pdfIn PDF document text
    • https://digireg.gr/upload/tatuzofujezatofuzov.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/4588695194.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/wabululesadofidotit.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/gibokosafutukinerabe.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/lowaweboni.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/bedel.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/munetetujojevuwaloxu.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/14152870804.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/nadaduwadironiti.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/45625850052.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/majezonizutoxedaturewada.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/61686442423.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/wegojuxil.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161313c93c989b---86418261612.pdfIn PDF document text
    • http://atek-ent.com/upload/file/64625179915.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/15356167857.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210908/1443266979.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/45615997212.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/silerejukobigofemitutiso.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/2641df0f52a89cc79fafb5c522f2b030/83201776467.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/27550448011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+change+apn+on+androidPDF 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_off0000d669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 10656 bytes
SHA-256: 86482937726553a18d15d1e744973f19a26f0ec8f54c2e10771604578d00fb87
font_02_sfnt_off000106a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A6 18288 bytes
SHA-256: 2c789d005bc80f290938bace86022c718a3baaf156c45607a4d0b4000ef79b61

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