Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07aaf75c034fc80…

MALICIOUS

PDF

75.7 KB Created: 2021-05-06 04:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d95649b2d27d5c3ec5f13fd48df55311 SHA-1: 0cde70ecf91577393a7e2ef42cff41bb30a0c5ba SHA-256: a07aaf75c034fc80b1492902e1bc1c3338240de60ab2d643e7fcc03ce6d679d4
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://jacksth.ru/strik?utm_term=how+to+get+rid+of+poison+ivy+growing PDF link annotation
    • https://cdn.sqhk.co/vusutazomaga/jeieghh/car_simulator_2018_xbox_one_release_date.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465269/normal_5ffeb5787f4c7.pdfIn PDF document text
    • https://cdn.sqhk.co/tavolimogid/FzijhbJ/homescapes_level_2492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451954/normal_600b67a0ac229.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420587/normal_5fdef4185e987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459341/normal_605969ca2cba6.pdfIn PDF document text
    • https://cdn.sqhk.co/fovugemut/Ygcflhi/blender_simple_animation_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500883/normal_6046fdd5dd49d.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/xifBSic/barbershop_movie_1.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/5726c89f-e6ad-4516-8984-7d66aa3a587d/how_to_get_a_welding_apprenticeship.pdfIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_6b3d5d0efe8c4e04a0ba9b55c4d39b7b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/96333ddc-b53c-4cf0-9d78-ae5bc9b188f5/36_questions_to_fall_in_love_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/759fd4cc-123d-4e40-8d6e-56b8780a1820/freelance_graphic_designer_cv_sample.pdfIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_2617e780c6ab47a8976c381c126a18c6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e13df6f6-1edb-4970-8a57-10fdecd8be32/example_article_summary_using_apa_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8be3268a-6289-4a63-a6bb-d83875c522ec/how_to_connect_jbl_flip_4_with_laptop.pdfIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_68da6faa9245437abf1f9b1e38530c54.pdf?index=trueIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_274951ac92d643ab85543ba223b61907.pdf?index=trueIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_8984534d30404a1db3056ceea958354b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8353eb3-567c-4213-9a66-d4808c6aa9ab/52367672030.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_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 5180 bytes
SHA-256: 747024780f62ee1fc4f81356002ec09c02ea3f330ed60b9f3a0265e206276794
font_01_sfnt_off0000fe65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE65 10316 bytes
SHA-256: 5126425cce6243a6668b7e9d88a76aef042e7e907597ada0bcf4ee247c3e4262

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