Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2b080f3ca57c2b…

MALICIOUS

PDF

70.3 KB Created: 2020-12-21 11:21:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a7a5ad2941d9d6d6d6ef251a50349dcb SHA-1: bb34b83fe9be4d99afa47286ab0ec44b2235cca2 SHA-256: 4e2b080f3ca57c2b9b7b51df9c8a6a9ac483dbda89cfe6bed1360306312a64ce
214 Risk Score

Malware Insights

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

This PDF file contains a critical heuristic indicating it links to known malicious redirector infrastructure, specifically a URL disguised as a Microsoft Azure training cost link. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were extracted, the presence of a malicious URL within the document body suggests an attempt to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=microsoft+azure+training+cost In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370777/normal_5f89839253954.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/duxujapif_jumepolifi_luzilarumezo_zomiduxevow.pdfIn PDF document text
    • https://nexuroge.weebly.com/uploads/1/3/4/4/134465667/1474255.pdfIn PDF document text
    • https://limezisetuf.weebly.com/uploads/1/3/4/8/134871661/detevejis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nuselufuzo/barbie_princess_charm_school_games_free.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/98872655554.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/anna_and_elsa_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/835390d7-5632-4edd-be17-3591ea1dc4f0/nada_atv_blue_book.pdfIn PDF document text
    • https://s3.amazonaws.com/welutizenop/kovekofum.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/chase_foreign_currency_rate.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/10_minute_guided_breathing_meditation.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/34365882655.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89F 4956 bytes
SHA-256: 40ab594407b2724de7bc56c23b1dc6dff9692905f78f393d5c7f0c03ed2c2eb3
font_01_sfnt_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 10960 bytes
SHA-256: 8fe9d2a356b8f21ecc6fc319a3f16b42b1d69a937c60ae1c9c39e98ce6439340
font_02_sfnt_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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