Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a33ba3a36067968…

MALICIOUS

PDF

72.7 KB Created: 2021-02-26 13:12:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 610025735bfac30695e3e3fc65e36a38 SHA-1: e76c8b5aa72bbf8b33d26ff58655c9d662f1a416 SHA-256: 5a33ba3a36067968dd51a05d2fc5a05155d074d8d5868da75a981d573198fd62
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the PDF structure and embedded URIs are indicative of a lure to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/award?keyword=becas+internacionales+de+grado+mescyt+2019 PDF link annotation
    • http://penageli.getenjoyment.net/foretinimuwejokajekiwe.pdfIn PDF document text
    • http://wotaxatumumodok.sportsontheweb.net/lonijozidosuv.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/FKjbwib/hello_neighbor_act_1_walkthrough_ps4.pdfIn PDF document text
    • http://pawezujexas.mywebcommunity.org/33962855064.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/wuxijuzugibasavip.pdfIn PDF document text
    • https://cdn.sqhk.co/woberimi/igRgjhg/sosumoxipimedavepurizaf.pdfIn PDF document text
    • https://cdn.sqhk.co/nalogigoke/idbHJha/tubemate_2._4._9_mod_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502567/normal_6001734ccf0d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_5fd09de371ae2.pdfIn PDF document text
    • https://dejokorakas.weebly.com/uploads/1/3/1/3/131379117/9d050a4baf681.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rukosivujuxu.atwebpages.com/32153129899.pdfIn PDF document text
    • http://sulijugofogim.onlinewebshop.net/cfa_level_1_past_exam_questions.pdfIn PDF document text
    • http://mawokale.myartsonline.com/feeling_faces_coloring_pages.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/rival_ice_cream_maker_walmart.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/xejodan.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA0 5892 bytes
SHA-256: 7e2a8e6133248223cfe0e7e4792d829374f4a065dbc911137cdde231b2a98826
font_01_sfnt_off0000efa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 11360 bytes
SHA-256: f15479fd75aad540e54ea1a0de5f29eee785f00f47cecfa37ffb08cccdb357ac

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