Malicious PDF — malware analysis report

Static analysis result for SHA-256 abcbb14d86130b46…

MALICIOUS

PDF

75.9 KB Created: 2021-04-07 09:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b0c60bbaf39b7ea5c14a9630f21305c SHA-1: 9abfcf8c8d75e28dc06f40a232aa80ce5073f200 SHA-256: abcbb14d86130b46284ac3f27cb743a480a4cbdb9f09c3168529ebefcc51409b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' containing 30 external links. The ClamAV detection and ML classifier strongly indicate maliciousness, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The primary attack vector appears to be directing users to malicious websites via embedded links, likely for phishing or to download further payloads.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wix?keyword=jessica+norris+facebook
    • https://jamekefexufi.weebly.com/uploads/1/3/4/8/134866820/38d9fcba79fb.pdf
    • http://sebevifa.getenjoyment.net/complete_book_of_drawing_techniques.pdf
    • http://trysalon.xyz/lepapanisopanesave9unmh.pdf
    • https://cdn.sqhk.co/wepigosogo/hdlje7q/gawabiwoxivini.pdf
    • http://tixesikixux.mygamesonline.org/zajipanofulenixevijaduro.pdf
    • http://copyrightsafetyhelps.com/cual_es_la_importancia_de_las_reacciones_de_combustion_en_la_vida_cotidiana5khps.pdf
    • https://cdn.sqhk.co/pajubopolak/hdhejbA/nikola_motors_badger.pdf
    • https://puzuzabijil.weebly.com/uploads/1/3/2/8/132814257/bavasaw_sibupigeruj_volibove.pdf
    • http://wozupabalaviv.medianewsonline.com/retowewa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b3cbdc98-8e36-4281-a9f5-d652011e1ced/1749858717.pdf
    • https://uploads.strikinglycdn.com/files/683e7934-d5be-4e4f-b515-f5ea9d774406/why_has_my_steam_cleaner_stopped_working.pdf
    • https://uploads.strikinglycdn.com/files/0472ca9e-bdb4-49ce-b521-ed517dc4e3ac/kumokul.pdf
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_b010b51980584e6883d9b6ceefe6052a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6e67b3dd-8309-4c92-bc4a-92855365e9a3/29077923557.pdf
    • https://uploads.strikinglycdn.com/files/748e65e8-98f4-497d-9f00-e5aaffa72cb9/682019272.pdf
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_9fa693c9c9f249c3ab973bdb2609f729.pdf?index=true
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_5625d62648f14e30b4e330bb78a46d5c.pdf?index=true
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_645fe2b0a1eb48cc828d262bad73a277.pdf?index=true
    • https://9b56c271-8e60-4ff0-96d1-8930f8c082f8.filesusr.com/ugd/5a1ab0_00f96958856048bdb0effe12487df0ff.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_off0000e8fa.bin
dd2a27650eb494dcf76c609047f7a269ed88bc3029ed4bfdedbe328a986b226f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 5036 bytes
font_01_sfnt_off0000fa2d.bin
a718f953b811e7b08434e060d0c0939ab0aa313580aec11ef4a26a88bf726b2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2D 11692 bytes

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