Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54ef3972a247b65…

MALICIOUS

PDF

71.5 KB Created: 2021-06-07 06:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ec416203508bcf6621ade18b8c7824c6 SHA-1: 24650f8896a417b60609cec3c3bb52b4ed0a7454 SHA-256: f54ef3972a247b6528a8731370287a972b7fe7c084502c1b3a0e9d1a0fb31228
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The embedded URL `https://cructi.ru/pbw?utm_term=rbse+9th+class+maths+solution+pdf+download` suggests a lure related to educational materials, likely to trick users into downloading a secondary payload. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious intent by identifying the document as part of a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cructi.ru/pbw?utm_term=rbse+9th+class+maths+solution+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445564/normal_5fedca51a59b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459165/normal_60489ea67589f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413850/normal_5fef6dae75dc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445115/normal_6022160d4d424.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a3cf13-eb48-4ea6-9665-cd68e7cb3a69/30491690188.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ece6a90-1c34-4232-856f-46a75f1d6047/how_to_do_shading_inequalities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc87b7d-6f9f-43ab-96a0-58a086a056d1/vewilufixes.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/42980035745.pdfIn PDF document text
    • http://gajufabeke.pbworks.com/w/file/fetch/144423063/how_much_do_designers_charge_for_a_logo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d370be9-f838-4d60-9484-3bcc36641fdd/how_to_get_back_in_shape_for_soccer_fast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46e5e359-4f36-48fe-b607-3412d50299bb/gimawamaza.pdfIn PDF document text
    • http://bijinim.pbworks.com/f/96724696357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/803dbeb8-7b85-4b56-808c-d5339c57d710/data_analysis_tools_better_than_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff61130f-f62d-458d-9e35-244337303a35/potanuvamulepuzewe.pdfIn PDF document text
    • http://xizalow.pbworks.com/w/file/fetch/144610914/54579428892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daa4fc05-09b8-497b-a860-89ebc47f1e06/89929776853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1045eb4d-4782-4019-b050-4e4ca890c328/57137450400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e020540-8bb2-4671-aa7b-a09b5bb90547/manual_bosch_silence_plus_44_dba.pdfIn PDF document text
    • http://lakobun.pbworks.com/w/file/fetch/144662061/28191117344.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/77876977449.pdfIn PDF document text
    • http://furalagaposu.pbworks.com/f/9054219169.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 5696 bytes
SHA-256: ff2a683a150c865f5df8f96b0f26aa2d4abea0d844e0557d42eaaef2c2d197f5
font_01_sfnt_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 10628 bytes
SHA-256: 0b39a5cd666fd69571b74c744b77d503ee7fd3b3a642523279de2c9cb5bfd12d

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