Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f535eea1067ee44…

MALICIOUS

PDF

87.8 KB Created: 2021-02-27 07:01:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 85244566d68838a0bc731639d54bdce0 SHA-1: b46882046d92ad24ff83f0c4f97c0713a33b8593 SHA-256: 8f535eea1067ee444f31e46b31202c91ea8e23ffb3f8873e2b48a5d669d1349e
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a primary focus on a link to 'crophysi.ru' which appears to be a lure for downloading a file. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for such links, suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wix?keyword=dios+mios+2.9+download PDF link annotation
    • http://copyrightshelpscenters.com/clasificacion_de_grannumymxcf.pdfIn PDF document text
    • http://ukranews.site/dry_cleaning_symbols_guide4yopi.pdfIn PDF document text
    • https://cdn.sqhk.co/pipujevi/jKhbig2/24101254789.pdfIn PDF document text
    • http://euroshopme.site/wink_live_apk_full_version3ez6z.pdfIn PDF document text
    • http://chambrely.xyz/kiss_the_rain_piano_sheet_simplestl5g.pdfIn PDF document text
    • https://cdn.sqhk.co/tifisizeliz/g9g1mja/vavobumezuvizef.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/avani_avittam_mantras_in_tamil_2018y5o6r.pdfIn PDF document text
    • http://opensalon.xyz/chogada_tara_song_dance7kn7q.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/how_does_a_turbo_boost_controller_workydra0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wujanozo/java_action_games_jar.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/solid_liquid_gas_worksheet_for_kindergarten.pdfIn PDF document text
    • http://gafelen.epizy.com/rcuk_als_guidelines.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_off000118d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D3 5284 bytes
SHA-256: 5f4766bd4685c805876e3c9dd2e20a1bee655ccb7b6dcc0b38a92ca557dde54a
font_01_sfnt_off00012ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD4 11708 bytes
SHA-256: 6457fb3b867130e8bdfc83d5e10f275829cad643a83e0abec5c34356a2002845

Open this report in the interactive analyzer, or submit your own file for analysis.