Malicious PDF — malware analysis report

Static analysis result for SHA-256 246388687293c539…

MALICIOUS

PDF

78.5 KB Created: 2021-03-20 07:07:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 01bbdefdd23122aa31575bc813e67fca SHA-1: 8620b17bc84d2c2ae8a88ba014dd7f27c81f3e6b SHA-256: 246388687293c5390ed1223b996789c5de914db9db61049efcf1eae7519ad690
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 0.9994

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://botokaw.ru/123?utm_term=aacsb+standards+pdf PDF link annotation
    • https://vevorusafe.weebly.com/uploads/1/3/4/5/134516648/8576266.pdfIn PDF document text
    • https://wetolobumusu.weebly.com/uploads/1/3/4/5/134579125/7090331.pdfIn PDF document text
    • http://donbetosstreettacos.com/why_is_my_mr_coffee_pot_not_brewingegv70.pdfIn PDF document text
    • https://kejarokelevu.weebly.com/uploads/1/3/5/2/135297316/68db315c.pdfIn PDF document text
    • http://womans30planet.com/facebook_lite_update_appspu2vu.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/kokadunu.pdfIn PDF document text
    • http://mazafaka69pussy.online/swing_design_10_couponntsdd.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/5273bc50-3f9b-412f-9f5b-8e821280fe36/what_is_classic_style_in_interior_design.pdfIn PDF document text
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_df33033229694bfc931dee18bd7db9ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/86708431441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aab9a818-5089-48c8-9327-ad8e5fe5cc82/46564806365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6e265a6-433e-49da-be9b-66930c7591e2/hp_laserjet_cp1215_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/raruzawizoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74329d39-7846-4cb0-8aea-470fa200487c/wigire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0464195e-9544-4b61-8a07-4981c54c11f7/nerujukedara.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/jodevefigiluvezudetuteson.pdfIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_5137a8e1ad1c47039a58a460d179a3ec.pdf?index=trueIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_6d47b046bd174317a3f4d67a542faa4d.pdf?index=trueIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_4d25131917e341459b5a42c7727353c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/88165299684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93532a29-24f0-4c78-8555-b70680a7a396/black_decker_workmate_parts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81dc2526-9413-476d-879b-a755e7495140/befugolu.pdfIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_8e14f8086110475d8011e9a615565609.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_off0000f46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 5248 bytes
SHA-256: 76ce83be8d7c84e9bc4441947e52160eeac637588949381bcef40295f342fdfa
font_01_sfnt_off0001064b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064B 10964 bytes
SHA-256: dff09c090639fdfce28b839bc1028fe635c58e13bb3e708c82c68a087129a07a