Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b903465ccc33b7b…

MALICIOUS

PDF

72.1 KB Created: 2021-05-29 12:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e586226e5bdb251f86ebdfb0de7669c SHA-1: 75ada96b9e2869649ec51b7ae5d2d117b8e34c2e SHA-256: 4b903465ccc33b7b48eb1f89738480bf169cd56dcbe6db1a6741695cb03ef92f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as search results for popular movies. The primary URL, https://nipisod.ru/strik?utm_term=movie+43+pel%25C3%25ADcula+completa+en+espa%25C3%25B1ol+latino+repelis, is likely a phishing or malware distribution endpoint. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://nipisod.ru/strik?utm_term=movie+43+pel%25C3%25ADcula+completa+en+espa%25C3%25B1ol+latino+repelis
    • https://cdn-cms.f-static.net/uploads/4448991/normal_603e33cdd177f.pdf
    • https://narapafugoziror.weebly.com/uploads/1/3/0/7/130775848/4a43fbd6cc.pdf
    • https://cdn-cms.f-static.net/uploads/4411708/normal_602470077bd01.pdf
    • https://bobilemako.weebly.com/uploads/1/3/4/7/134733435/5950329.pdf
    • https://pebitazoma.weebly.com/uploads/1/3/4/8/134849778/9797708.pdf
    • https://palotuzumi.weebly.com/uploads/1/3/5/9/135991270/f5819bf3a8eca15.pdf
    • https://static.s123-cdn-static.com/uploads/4467273/normal_5fc93ab9a53bf.pdf
    • https://vuguzakinizole.weebly.com/uploads/1/3/4/4/134493236/kowuve-munipa.pdf
    • https://cdn-cms.f-static.net/uploads/4443823/normal_6061935376871.pdf
    • https://zadidiboz.weebly.com/uploads/1/3/5/2/135295834/4863729.pdf
    • https://guduzuzej.weebly.com/uploads/1/3/1/6/131606672/8f4e81a029.pdf
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/62ff0.pdf
    • https://cdn-cms.f-static.net/uploads/4478134/normal_6050e457ef100.pdf
    • https://rodekimixew.weebly.com/uploads/1/3/4/3/134314341/e1d8975107.pdf
    • https://static.s123-cdn-static.com/uploads/4413862/normal_5fe0f5ba396f8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3c0ce173-6354-4927-b499-f21c1b18ec04/sword_art_online_anime_series_order.pdf
    • https://uploads.strikinglycdn.com/files/0a8c20e3-5167-4a83-bc35-bdaf35f99e09/who_was_the_white_tiger_on_masked_singer_season_3.pdf
    • https://uploads.strikinglycdn.com/files/7eb369d9-ef34-4d88-8d60-967aa3fb14d4/how_do_i_love_thee_sonnet_43_summary.pdf
    • https://uploads.strikinglycdn.com/files/e97085c6-ae7d-4554-8c96-881820611b7a/how_to_use_dvr_on_comcast_remote.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_off0000d8de.bin
b3a4952faeab37111302f3d4d6d6eff20dfc3a95c1a523ac0f7f188e8bce79e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DE 5664 bytes
font_01_sfnt_off0000ebe7.bin
0cdb08a2d28c0287142689f364fc4415a62c5eab915591229a0fc8a284eb7488		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 10980 bytes

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