Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bfd3ea11bdd8c8…

MALICIOUS

PDF

74.0 KB Created: 2021-10-02 14:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16272facf0e5a4db8f490e744c7093aa SHA-1: f131a79fbce173a036833301eef4d07c28f03d15 SHA-256: 92bfd3ea11bdd8c81e9d9295d8c53c24565bebf74da03ce7744975937a3e1580
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=down+to+the+river+welshly+arms PDF link annotation
    • http://meghdoothsuzuki.com/uploads/37344546590.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/femizisidimevafu.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/xowure.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210927024823.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/30717272311.pdfIn PDF document text
    • https://invision.buzyhub.com/files/mikoparapinodib.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/28339039521.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/zifukasibapuvonom.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210906_022004.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/fufivuxakajepepajuge.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/56875313038.pdfIn PDF document text
    • https://rajaunited.com/contents/files/41214096899.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161365c071ed96---rebovixojigadifa.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/labowakatubovegoguxik.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/98582807100.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142dd6f55a53---96280929749.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/monez.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/83498027478.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/86167627669.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/liporivoxobejum.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/53538315063.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/45629625064.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/50688457705.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/rumipapobukilerazipe.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_off0000b5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F2 20376 bytes
SHA-256: 314e1d9335a80c28c918704debded36ff1aed55b805d430dac406f999362f616
font_01_sfnt_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D6 10640 bytes
SHA-256: 1602602d0b586ec2fc618647c051e751c08daec3c4df80d2ce155b959714cddf

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