Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a51cf910cf18fb2…

MALICIOUS

PDF

67.4 KB Created: 2020-12-24 03:09:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d3d91a0577d8375c36ce97dcfa06a59c SHA-1: 1546a0d6155eb47b1b4b5a466912be30b7969b87 SHA-256: 8a51cf910cf18fb229d7613233aa5255c12f8efcdf3c227452b896b796bc4148
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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://trafffi.ru/strik?utm_term=roblox+auras+hammer+simulator+codes PDF link annotation
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/1966476.pdfIn PDF document text
    • https://kowevufewes.weebly.com/uploads/1/3/4/3/134388306/0d7224960.pdfIn PDF document text
    • https://midumelu.weebly.com/uploads/1/3/4/3/134341446/balug.pdfIn PDF document text
    • https://zufogeseganoxe.weebly.com/uploads/1/3/0/7/130776657/5423796.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/jawemepuwiwifisuluf.pdfIn PDF document text
    • https://zadavutuni.weebly.com/uploads/1/3/4/3/134343582/wibapanarubifu.pdfIn PDF document text
    • https://cdn.sqhk.co/xezojutatow/eCichhm/modern_day_arcade_cabinet.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/wopari/worksheet_periodic_trends_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/canon_lide_120_scanner_driver_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/mitadozo.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/78668941776.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/balgeet_free_video_3gp.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/kusafogef.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_off0000ca78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA78 5396 bytes
SHA-256: b8bbb7105f03b4968791c7308c6f7ea1ea2cb81c8b9e4af5bed53a348c939cc3
font_01_sfnt_off0000dca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA8 10608 bytes
SHA-256: b88764bca7beb95074c82d8284635dfec15f5f34487dc3ac39189ad16c081788