Malicious PDF — malware analysis report

Static analysis result for SHA-256 163ba2c06f2338d6…

MALICIOUS

PDF

69.0 KB Created: 2020-11-13 03:24:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6fbb5db37b185b0d75f16622ad484840 SHA-1: d865da062450328c4103d8a740af1b24fc867054 SHA-256: 163ba2c06f2338d6f6e4426f99547f026a902a05e64666295ae332718575fad9
186 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 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://trafftec.ru/123?utm_term=slim+select+keto+ingredients PDF link annotation
    • https://vefawedufuzagi.weebly.com/uploads/1/3/4/7/134718770/tidamunedifimorigepe.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/9834505.pdfIn PDF document text
    • https://paboludozov.weebly.com/uploads/1/3/4/3/134333588/romuwodumefuza.pdfIn PDF document text
    • https://zemuxarasojutin.weebly.com/uploads/1/3/4/3/134374283/9736539.pdfIn PDF document text
    • https://zikenanevo.weebly.com/uploads/1/3/4/5/134589255/6cc6ab7f540fa6.pdfIn PDF document text
    • https://minibimegoviw.weebly.com/uploads/1/3/4/3/134333268/mokisezowomexit-wigetopetuf.pdfIn PDF document text
    • https://damitonamusu.weebly.com/uploads/1/3/4/3/134306925/viguj_zivewiz.pdfIn PDF document text
    • https://rawogozanukej.weebly.com/uploads/1/3/4/6/134623914/5625753.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/vexosafugunu/pomij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b49e4955-246c-483b-9780-1c6680477773/gold_watch_terraria.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/35699747594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdd50911-924f-4352-b807-5183a07f5a30/models_attract_through_honesty_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/osrs_fire_cape_guide_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e82764f-19fd-443c-b0c4-9445f7c64a31/introduction_to_aircraft_flight_dynamics.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_off0000d227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD227 5216 bytes
SHA-256: ec8f5b88465b3132e2971d0dac1555e4353ff7ffbeb516ecf7a019b8ffe59f02
font_01_sfnt_off0000e3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D1 10364 bytes
SHA-256: b08faf1e7a48f56aba327b1b9a3361a6c29c71073052e097e8c80e89b63e4109