Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27c2a14adc28829…

MALICIOUS

PDF

85.9 KB Created: 2021-10-06 17:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4d8f846b32c906e1f541cd06314b55b7 SHA-1: 7deec278f464b6021807a71acedcf37bc2f2f4a6 SHA-256: a27c2a14adc288296b7ab9af0dcb1a498141d5aa521264f27d01231fec40e3e4
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the nature of the file suggests it was likely delivered as a Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.6629

Heuristics 5

  • 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
  • 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://ketchas.ru/uplcv?utm_term=sequence+of+yoga+positions+called PDF link annotation
    • http://sinners-party.de/media/file/ronakisarobuv.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/nidakegur.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/zaxetunupinu.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090519480173499.pdfIn PDF document text
    • http://weingut-suppan.at/files/50846400852.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/xelidetajewekusozeda.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/nusedemajevutifejisuxoka.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/75336851149.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/93521683018.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/17062269923.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/dorulodat.pdfIn PDF document text
    • http://hadt.vn/upload/files/19852853799.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/gesugatuvuxex.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/xekitug.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b96b90eb02---posisitawolapenubus.pdfIn PDF document text
    • https://edgecs.com/documents/90824337084.pdfIn PDF document text
    • http://briztravel.com/upload/files/28765161785.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/zutirixasanuguna.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/sawubedekovu.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/wozekedagodopefusufu.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/rofewiludosozowe.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///newudonitizax.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C9 11128 bytes
SHA-256: 62bb3a255200b2450a095c59c9d6f0df15132c061b730a8869cc4838a4772628
font_01_sfnt_off0001416e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1416E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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