Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bacce0fd4565f6…

MALICIOUS

PDF

73.3 KB Created: 2021-03-14 01:50:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 07f73b8256c6a2f7519c5748155032c1 SHA-1: 14fd7c8489b62be98950a21d356b49e809ac6c8e SHA-256: a3bacce0fd4565f6ab046570498fef2858816bb2aa7be23eb516846a787e1128
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 0.9997

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://druttle.ru/strik?utm_term=probability+practice+worksheet+answers PDF link annotation
    • http://fumatiw.mypressonline.com/neet_2020_answer_key_aakash.pdfIn PDF document text
    • http://wuramegojuluz.mywebcommunity.org/41791628199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413119/normal_6049ceacbe0dd.pdfIn PDF document text
    • http://sepukolobu.sportsontheweb.net/documents_needed_for_new_ar_drivers_license.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456134/normal_5ffbec2d8de60.pdfIn PDF document text
    • http://mirumumavetifun.mypressonline.com/java_struts_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463554/normal_6045eaeb4d1cb.pdfIn PDF document text
    • http://obschee.xyz/46857378825by03b.pdfIn PDF document text
    • http://juilopkiretlo.ru/b_format_paperback_marginsbo6mw.pdfIn PDF document text
    • http://natur-bio.space/flowermate_v5.0s_reviews9s8f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_1093608cac2240569348c1332fa19c38.pdf?index=trueIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_7c631a69af304bd789c5c04146d7d36c.pdf?index=trueIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_48f29fe8eac24118842717f85bea7eb9.pdf?index=trueIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_e6eb242918e647379f817b7147fe57da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4474bfb8-6317-4d98-baf5-4d18e4c1e404/tevopetokusoxit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57645cbf-3197-46a3-b076-540637e7396e/56892088903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af3d15cf-7ce0-459d-be3b-cb773f7f843e/41808913299.pdfIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_0cac1ce26c1540a1ae6c1e594d663fe5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0583d7b-3dab-467c-96a4-b607034c699e/sidejamuxukedinipa.pdfIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_e5a5e65fe93b46b4838ee0f057200703.pdf?index=trueIn PDF document text
    • https://2ad55d82-15d9-4995-b72c-f03dca93b5f4.filesusr.com/ugd/11b7eb_5f1dd827d1264e038a9021793a9768bd.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_off0000df5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5A 5420 bytes
SHA-256: e823a5d71f05d9791b1b5270b4fdeeae2ef4042bd22d058eb6f01d2429ae4cfd
font_01_sfnt_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 11196 bytes
SHA-256: a2c4245d2139b18f54697aa824ee66b113fe0c91fb51cd71c8015851b5bc2d6d