Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c18f61d72bc498…

MALICIOUS

PDF

77.9 KB Created: 2021-04-08 05:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 23e0e0644590f79f283fafe65727bca0 SHA-1: a896c380e303b61de8fd8ffedb47e7fa12081ca4 SHA-256: 77c18f61d72bc4989740eba9d6bf527bf26aafbb19542ad50f860e879d4080c7
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('soxebez.ru' and 'medianewsonline.com') that are likely part of a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/strik?utm_term=astra+militarum+codex+pdf+9th PDF link annotation
    • http://rawiduti.medianewsonline.com/18311014407.pdfIn PDF document text
    • http://mizejodaf.mywebcommunity.org/5234807443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380213/normal_6058611a35722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454965/normal_6035eaef5f1c1.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/77703230810.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446270/normal_60470352d3477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503390/normal_60515f068b078.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/30b6f334-983b-4a31-8550-1dff83343224/how_to_turn_on_sharp_air_conditioner_without_remote.pdfIn PDF document text
    • http://kuwosuz.rf.gd/comparative_adj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed69609c-96ab-436c-9f4f-09df0b9575f2/fezudomur.pdfIn PDF document text
    • https://6d0c6d30-55b9-4b7f-8145-34d11b484ddf.filesusr.com/ugd/8db56d_f9d06bc37ec2416183ab6747cdefcc36.pdf?index=trueIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_6f9bfde2416342c6afc558dd80c75883.pdf?index=trueIn PDF document text
    • http://rerumixididepu.rf.gd/3686194300.pdfIn PDF document text
    • http://sobibuxasegisun.rf.gd/posumisijudofex.pdfIn PDF document text
    • http://gemawinikifiv.myartsonline.com/biochemistry_mbbs_practical_viva_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/noco_charger_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42431b5d-2f85-4eda-af04-0284255516e8/is_being_very_emotional_a_sign_of_labor.pdfIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_9e6565c74e3148d2b8b0fb04f9365957.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/purawuma/column_subtraction_worksheets_year_2.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_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 5608 bytes
SHA-256: 8d04a82a69cb1564973ea98058fa1684a8610111a3e37d423280df713a92f7a7
font_01_sfnt_off00010502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 11004 bytes
SHA-256: 8b6ccd2af399ef71d28ac68b5365b821c6a1a3465e03c41a7b0deb7549ec8f58

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