Malicious PDF — malware analysis report

Static analysis result for SHA-256 650ac9d21590ca84…

MALICIOUS

PDF

83.7 KB Created: 2021-03-18 12:44:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1479ff4c7199a262d6a1cbe75ae3e10 SHA-1: b84ce4c468a920f8663644ebfc63754040403417 SHA-256: 650ac9d21590ca844b22f2c5a0fbe907fbf5c392305f08a0d2d728783482b42e
96 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of numerous external URIs, including suspicious ones like 'vilenefex.ru', indicates a probable intent to redirect users to potentially harmful content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://vilenefex.ru/wix?keyword=deer+feeder+plans+pvc
    • https://cdn.sqhk.co/dawadetugas/urE4ehd/block_puzzle_star_gem.pdf
    • https://xedasijaw.weebly.com/uploads/1/3/1/4/131453620/fusuvalabavifide.pdf
    • http://akfb.online/defending_jacob_cast_episode_1o7060.pdf
    • http://artyom.guru/nikon_prostaff_rimfire_ii_3-9x40_reviewzpb6x.pdf
    • https://cdn.sqhk.co/jabisopomuxo/eDdxbjj/join_clash_3d_mod_apk_terbaru.pdf
    • http://beremoter.online/ap_language_and_composition_reading_list_20200z97q.pdf
    • https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/nezidipenif.pdf
    • http://copyright-securityx.com/592308741129blcp.pdf
    • http://help-bluebadgecenter.com/new_status_app_hd_unlimited_status_appleygzm0.pdf
    • https://cdn.sqhk.co/vekunego/jjdMsjh/rituwevipokek.pdf
    • http://gnfcns.info/honeywell_wireless_thermostat_not_communicatingks8ul.pdf
    • https://xizirasifeda.weebly.com/uploads/1/3/4/3/134344010/sisotalamer.pdf
    • http://smcjd.com/47520382221s16xh.pdf
    • https://giwitororozesal.weebly.com/uploads/1/3/4/6/134652081/3457425.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mipizaju/up_state_c_form_verification.pdf
    • https://uploads.strikinglycdn.com/files/505e3cd7-f650-4836-9289-63dc9a1c77e3/how_to_connect_sharper_image_wireless_earbuds.pdf
    • https://uploads.strikinglycdn.com/files/a2c5eb44-3482-4305-acef-0d882f845318/maths_real_analysis.pdf
    • https://uploads.strikinglycdn.com/files/fce8cdbb-93f4-47fa-8256-906e8a1f5a79/1975_honda_cb550_wiring_diagram.pdf
    • https://uploads.strikinglycdn.com/files/1b5fed1a-feef-463a-b9e0-b52aaf3020d7/zoken.pdf
    • https://s3.amazonaws.com/nutanigonu/77390891067.pdf
    • https://s3.amazonaws.com/tenunud/20926074143.pdf
    • https://uploads.strikinglycdn.com/files/cbaa097c-2846-40ee-a1a4-3b244e4b2724/viledarinekurixin.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_off00010c39.bin
4e6fc4d6aa41d0a426bf4d476bdf1d0a2811681e55b38a6f687cc189759b5113		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C39 5208 bytes
font_01_sfnt_off00011e0f.bin
954b4d13ddb8fa2918f558ef501985c8d8dad3a7bd8ba7b3a3c551a7b28bbb4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0F 10436 bytes

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