Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ff40885da879a9…

MALICIOUS

PDF

67.2 KB Created: 2021-03-18 00:09:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ada5fab3b422f3c133ac73ac4af766d1 SHA-1: 710d4ba39f473d499349476430729c7e4d8630a0 SHA-256: 52ff40885da879a98cbd6d4aa8555b31fe9b69fe36660e185f736e03eab601ae
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly and other free hosting services, suggesting a link farm or phishing operation. The 'PDF_SEO_LINK_FARM' heuristic firing indicates a large number of generated links, and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or scam campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/award?keyword=cambridge+english+fun+for+flyers+pdf
    • https://kozewofedira.weebly.com/uploads/1/3/4/8/134899359/jujipigazeb.pdf
    • https://tidukefawa.weebly.com/uploads/1/3/4/8/134851120/3797830.pdf
    • http://nadipewin.mywebcommunity.org/jivoretob.pdf
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/ribolapaju.pdf
    • http://zumanidoxup.medianewsonline.com/apnea_obstructiva_del_sueo_y_anestesia.pdf
    • https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/181dc73c986aa4.pdf
    • https://munipepuxorikoz.weebly.com/uploads/1/3/0/9/130969311/rirexovolerevo.pdf
    • https://latoratepowubum.weebly.com/uploads/1/3/4/7/134713938/2418554.pdf
    • http://zovolexune.sportsontheweb.net/winds_of_winter_sample_chapter_barristan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_61ddfc439ec94f32ab13faffc159f1c1.pdf?index=true
    • http://bodirinukamole.onlinewebshop.net/bocio_multinodular_eutiroideo.pdf
    • http://zulojijokonox.rf.gd/app_store_apple_ipad.pdf
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_5080166a305e40fcaf918edd65ebaae7.pdf?index=true
    • http://jaxunukologefis.onlinewebshop.net/automatically_delete_blank_pages.pdf
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_02cac0fa99bf4a59b78011069cbe2e49.pdf?index=true
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_0ff22589d6db431abeb848e65fb6c2f9.pdf?index=true
    • http://jusarif.rf.gd/how_to_get_extra_high_school_credits_online.pdf
    • 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_off0000c928.bin
a6dbb29818496a84736ad13ff27a57505b5ca3ab361b4045ebafd2e470a982e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC928 5600 bytes
font_01_sfnt_off0000dc05.bin
79285c850d4000ad8e5d279c9a1264c4cb4c8943cbff3551271ea4fb914c6fda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC05 10508 bytes

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