Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb809fb90fa50dc4…

MALICIOUS

PDF

71.6 KB Created: 2021-01-23 11:28:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ef2f7e280424e35e4ffba77c4de96aeb SHA-1: b73a1268cd8bd7dc5342d31842319aa09b48da5b SHA-256: eb809fb90fa50dc431e583ed3cefd0e06aff37cf945cc755c52702c265af0731
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicative of a link farm designed to direct users to potentially malicious content. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely used as a lure for phishing or malware distribution.

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://baarspo.ru/aws?utm_term=borrower+defense+to+repayment+loan+discharge+form PDF link annotation
    • https://nobixerevogug.weebly.com/uploads/1/3/4/4/134481004/xojuxi.pdfIn PDF document text
    • https://site-1168267.mozfiles.com/files/1168267/colours_worksheet_for_nursery.pdfIn PDF document text
    • https://niniteju.weebly.com/uploads/1/3/0/8/130814631/54f5d90df.pdfIn PDF document text
    • https://site-1168194.mozfiles.com/files/1168194/crossword_solver_former_german_kingdom.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/jaiaHjg/kopubonesafof.pdfIn PDF document text
    • https://cdn.sqhk.co/bepifopid/9bjejfO/basketball_hoop_games_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/buzusodova/hjgCcNd/3242848954.pdfIn PDF document text
    • https://site-1173660.mozfiles.com/files/1173660/58776681162.pdfIn PDF document text
    • https://site-1168056.mozfiles.com/files/1168056/44843696155.pdfIn PDF document text
    • https://site-1208753.mozfiles.com/files/1208753/best_suv_deals_right_now_canada.pdfIn PDF document text
    • https://site-1251821.mozfiles.com/files/1251821/55841046747.pdfIn PDF document text
    • https://cdn.sqhk.co/jabezoxujo/jjpNyjc/85537917015.pdfIn PDF document text
    • https://cdn.sqhk.co/sozovifena/jgihbja/giant_neostrack_firmware_update.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/vedexajawo/kivakawubax.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/51216750319.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/video_converter_laptop_software.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_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 5812 bytes
SHA-256: ddc3442d3b9cfae0c7d4d355294f06a35446d190669f8e06321365ae153e94e2
font_01_sfnt_off0000ee6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6A 10216 bytes
SHA-256: d644dc2ad9c8c0b6f0e57a3395eb2af652c5a206e713aa00fdbbcce4e2b6d20a

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