Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b7683d7ca72301…

MALICIOUS

PDF

71.6 KB Created: 2021-09-17 19:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f3544f16b9388c2c7f01a404f2305534 SHA-1: 47fe6a9971f4bdde3e4353779167dc5e6eda5164 SHA-256: 25b7683d7ca72301e7d6571acaf0c33c682ac67cebe3822c1cd90aa47ac8bde7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, some of which are hosted on disposable domains, suggesting a link farm or redirection mechanism. The PDF structure and embedded content are indicative of a phishing or malware delivery attempt, likely leveraging spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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://oniceh.ru/uplcv?utm_term=van+trung+ca PDF link annotation
    • http://jumpinfit.it/userfiles/files/39972418287.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/38934788653.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57685125431.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/71944268971.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/m3ua95ert62fninna33fada5ji/jekizizodozibel.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/pofanataxe.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/naxikiri.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/86483379854.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/39562582744.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/zajukigugapaxizipamarele.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/37876721072.pdfIn PDF document text
    • http://planbmedia.hu/files/koxisema.pdfIn PDF document text
    • http://temple.mo/userfiles/file/rifevuvojivabugedulajid.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/33961382221.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/dibipopuxatotaxexeruwalir.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/warutipetunoxufidikot.pdfIn PDF document text
    • http://underbutter.cz/download/foto/saxejigovexuxipev.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/bakeliwojidinal.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/kuzumewolinet.pdfIn PDF document text
    • http://jsdarvin.com/files/pikazufupojekoki.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/negufakajejimovamos.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/loturotinisurebulogupuduw.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_off0000b306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB306 9916 bytes
SHA-256: 16b19483b33c72aed2381b03441d3d2dd67675e4f58001ddb72920cf75762e8c
font_01_sfnt_off0000c90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90E 17812 bytes
SHA-256: 6b40de710e213415fef5ca1062163773d66d364c36a04af155b35bcf196cd60a
font_02_sfnt_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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