Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c2fec9d9c66001…

MALICIOUS

PDF

78.5 KB Created: 2021-03-09 10:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: ba837afde4dee3228236c54ea171db63 SHA-1: 85b1eee31fa3e9ac1feca78bd517d11894673988 SHA-256: c9c2fec9d9c660014593bde05c2aa6f8214782568c705622eb60f69fafdcb8af
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/wix?keyword=batman+bike+helmet+and+knee+pads PDF link annotation
    • http://technodom11.com/27921224762qnixl.pdfIn PDF document text
    • http://mpvideo.org/vexorevegoy77a.pdfIn PDF document text
    • http://duxeluwezix.iblogger.org/zadumen.pdfIn PDF document text
    • http://fatogotem.22web.org/sharepoint_designer_manual.pdfIn PDF document text
    • http://drive4mclaneeffingham.com/49967350187st7go.pdfIn PDF document text
    • http://varietystore.website/acura_rdx_2008_manualcoiyw.pdfIn PDF document text
    • http://sunepoxuvigos.66ghz.com/13_reasons_why_season_4_release_date_australia.pdfIn PDF document text
    • http://notdull-eng.online/vevevajuzewoveparevoka75lp.pdfIn PDF document text
    • http://texulateniz.iblogger.org/36536196688.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_89ad62d3d7134b248d0f06480b481917.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_29744b24d4c840af948a2e538b3ed969.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f595b47-8c5e-4386-9ec4-189c6a8f1808/how_to_determine_molecular_geometry_and_shape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a15fc670-d021-47af-9cc0-4e0e2a4d8b34/bepopevasedigezawir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef3879c1-d70d-4da8-a0b3-e520907255c6/cules_son_los_sntomas_de_cuando_se_te_cae_la_vejiga.pdfIn PDF document text
    • http://vinegufoxa.rf.gd/burger_king_gutscheine_2019_juni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdd6d339-4860-4abb-81ac-eb2da6819619/international_journal_of_applied_business_and_economic_research_impact_factor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5102344f-6158-4c31-b10a-79f23b500507/91979092121.pdfIn PDF document text
    • http://movufitajameme.rf.gd/powerpoint_presentation_templates_for_research_proposal.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_098b644faf374bd0be5d4b4f51edaa7d.pdf?index=trueIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_f728d3ed56c1417da23d9f07a52ba880.pdf?index=trueIn 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_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 5356 bytes
SHA-256: 97034af4416915413bc8e353cceed74f483b403aace2ec7944fa7bfea8bd7536
font_01_sfnt_off000107d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D4 11088 bytes
SHA-256: 333f793073883d5a825d273e9c49c0b9923a027e639747c51e523b23857541e6