Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6ebe6188e3e255…

MALICIOUS

PDF

74.4 KB Created: 2021-06-06 20:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: db6930701a4c467b3cca063a856f1353 SHA-1: a87d6944b9f20968bf3c14d1cddd470cababdeb8 SHA-256: 9d6ebe6188e3e255faf003aa3fb36f1ea7022b1a66df7748332befb37aeba98e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to link farms hosted on disposable domains, suggesting an attempt to obscure the ultimate destination. The primary malicious URL identified is https://krisoc.ru/pbw, which is likely used to redirect users to a phishing or malware-hosting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://krisoc.ru/pbw?utm_term=how+to+use+online+map+data+in+autocad PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485166/normal_5fef3fbada744.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447434/normal_5ffb043bbcf29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414173/normal_6048599198811.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492546/normal_5fe45f9525617.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414159/normal_5fc61e942e452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385848/normal_604887d7e2d9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420019/normal_6034c53bc259f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481830/normal_60628a9a79616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380887/normal_6011e3302ec90.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/2f5d6f22-f59c-41c1-8d18-d7b601009d35/bmc_-_building_materials_and_construction_solutions_locations.pdfIn PDF document text
    • http://ruwezebom.pbworks.com/f/mb_ascp_study_material.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cd819cd-cb7a-4bcf-bd46-c3ff3243ba56/99435026140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b13587a-6e05-4b8a-84c7-e99c73881a95/metodologa_de_la_investigacin_ciencias_sociales.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/f/download_adobe_reader_professional_7_free.pdfIn PDF document text
    • http://tevimunon.pbworks.com/f/pitebejujisolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ee9385-ec08-42e8-af09-fa09d847f575/34728253440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15ea3568-d8b1-438e-8a7c-97632d561939/8398616185.pdfIn PDF document text
    • http://zepupifob.pbworks.com/f/hartford_vt_police_blotter.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/f/57143516079.pdfIn PDF document text
    • http://fuxijovipa.pbworks.com/w/file/fetch/144614088/94007695502.pdfIn PDF document text
    • http://nagaxop.pbworks.com/w/file/fetch/144609234/how_do_you_reset_iphone_3gs.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_off0000e40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40D 5176 bytes
SHA-256: 983a7a8d0855562cfbdd4c33dcbb8d6d6e5df5b4f77aecebea4c3f70ac7476d8
font_01_sfnt_off0000f5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 10936 bytes
SHA-256: a5eea0adb088144939df67036e0919bd30933dbd55531dbbeaaf3d5d14b9cd3f

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