Malicious PDF — malware analysis report

Static analysis result for SHA-256 64841749535b0735…

MALICIOUS

PDF

68.7 KB Created: 2021-03-22 12:02:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf9078a0cc3b462530f1d5e9df0ccf97 SHA-1: 74b3ae14a7b2009bf11030ac590aa15a06c6e3f4 SHA-256: 64841749535b073578e2c733feb0834f46671365d0045e9aead8efedb891b02c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to disposable domains, strongly suggests a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious lure.

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://resalured.ru/strik?utm_term=radio+shack+mpa-250b+specs
    • http://eglo.club/harry_potter_movies_in_hindi_free_dotceup.pdf
    • http://pasipodo.mypressonline.com/25115281806.pdf
    • http://lofitner.buzz/7734291091t31mz.pdf
    • https://cdn.sqhk.co/mujejadalale/igbHihE/peppa_pig_hotel_deals.pdf
    • http://ionatr.space/84181574467m1b42.pdf
    • https://cdn.sqhk.co/lijusute/zjjurZ5/fepevaxitovolepal.pdf
    • http://jufanurozud.getenjoyment.net/assessment_evaluation_measurement_and_testing.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b9264059-5ce6-458a-812b-58b21e0c51d1.filesusr.com/ugd/9a3dc1_e34446b284884c5a8a91b7f04c2d9c6b.pdf?index=true
    • https://s3.amazonaws.com/wujixus/examples_of_total_coliform_bacteria.pdf
    • http://perexuwofogefo.onlinewebshop.net/33228023843.pdf
    • https://s3.amazonaws.com/kozibowisenatu/32211819184.pdf
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_591480c0d3d24fc5ba9b5b36128ae512.pdf?index=true
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_4dee797f93984894919de0e4c99f87d4.pdf?index=true
    • http://sodowurivav.onlinewebshop.net/oxford_advanced_learners_dictionary_of_current_english.pdf
    • https://s3.amazonaws.com/jedadokuti/scag_tiger_cub_manual.pdf
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_3a1b1bad6e7f4ffcb565073130d0b766.pdf?index=true
    • https://203e60c5-e32a-4587-ab6d-31d66de6d5b9.filesusr.com/ugd/014c36_9429458399844a2fa314a84fd4235403.pdf?index=true
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_07c9709ee74d4ca2a03c459740df98be.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc9d.bin
80fc78572b4d660d5cae481282f710653095b09eb9a5df79365d27b3b09f3b72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9D 5824 bytes
font_01_sfnt_off0000e057.bin
67aac941c79c0138bcc6f4442c61185acd046f1d38937bb6c55a1c764c490a31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE057 10956 bytes

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