Malicious PDF — malware analysis report

Static analysis result for SHA-256 7852546d592053f7…

MALICIOUS

PDF

78.0 KB Created: 2021-03-09 09:33:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20162165a18d127d6b0ddc78b750bcac SHA-1: 90fe6f84c0e3a21d915ddde34ba9efb87dc632a6 SHA-256: 7852546d592053f7feb8a8622ea079e69ff12926304aac0ed07ac83571b7d537
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, 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-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://midufefew.ru/123?utm_term=automotive+shop+management+software+free
    • http://mugafopame.iblogger.org/mandalas_de_calaveras_para_colorear.pdf
    • https://cdn.sqhk.co/libuzewis/gfjcdhc/logejadobipilegasapi.pdf
    • http://topuniversityru.fun/726016319336rm1r.pdf
    • http://xtrading.buzz/sufokuguzifunaliluu9i.pdf
    • https://cdn.sqhk.co/kigakikijebo/jCniiwd/how_to_iron_trousers_without_an_iron.pdf
    • https://mudulavodeg.weebly.com/uploads/1/3/1/0/131070753/c7403dc04.pdf
    • https://vimititop.weebly.com/uploads/1/3/4/3/134339659/bavijemobevi.pdf
    • http://vavesojijakoju.iblogger.org/airtel_data_bundles_for_android_2018.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/likerajatob/629283149.pdf
    • http://pigozezidum.rf.gd/64312660269.pdf
    • https://s3.amazonaws.com/daniwodug/what_is_the_suitcase_size_for_carry_on.pdf
    • http://fukevitadej.epizy.com/how_to_adjust_throttle_position_sensor_chevy.pdf
    • http://bepowawon.rf.gd/how_much_is_echo_dot_2nd_generation.pdf
    • https://s3.amazonaws.com/gisujubolidine/sap_crystal_reports_2013.pdf
    • https://s3.amazonaws.com/dobesogum/famowozofegeradevurapurin.pdf
    • https://s3.amazonaws.com/bejexe/4875912642.pdf
    • http://pomababotesu.rf.gd/arquitectura_renacentista_italiana.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e799.bin
52a25cb45e5f6a2ab2f0ed442c7480b63d9a54dda82bfe973896b7091cad5280		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 5304 bytes
font_01_sfnt_off0000f99b.bin
7962160eea9c4c502d8a67b92c6145d4defc01673d4dce8247ca52b928196b12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 10300 bytes
font_02_sfnt_off00011cad.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAD 4324 bytes

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