Malicious PDF — malware analysis report

Static analysis result for SHA-256 3813ae53ab5a18bf…

MALICIOUS

PDF

80.7 KB Created: 2021-03-14 04:19:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b57e4443bbf0796fd0848d0c352dc251 SHA-1: 00d50fad1e2e7452cc12537fb7099cbf7ebec975 SHA-256: 3813ae53ab5a18bf54383ef6126a8d409d0e479f53dd5c91ac5824d3163e5bd9
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to reference 'Arrl handbook 2019', suggesting a lure to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://resalured.ru/123?utm_term=arrl+handbook+2019 PDF link annotation
    • http://texno3ua.com/what_is_the_distribution_of_tropical_rainforests_and_desertsxt9h0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453743/normal_604cb3c57f446.pdfIn PDF document text
    • http://zoxodur.sportsontheweb.net/converting_cdr_to_online.pdfIn PDF document text
    • http://gaydating.world/77909172961wvbl9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387410/normal_601bd2e9505f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369166/normal_600be7df7873d.pdfIn PDF document text
    • http://nezowigivomi.scienceontheweb.net/pentair_easytouch_wireless_control_panel_manual.pdfIn PDF document text
    • http://notdull-eng.online/how_to_use_nighthawk_as_a_repeater9xd1z.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/angelcare_bath_support_chairnw8l3.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/lopadivupudexa/manual_basico_de_autocad_2007.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/55838493224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a4bc107-f8d5-4755-83ac-157d6229baff/prisoner_b_3087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90fb16d5-12db-43f5-ae84-b2f510263c5c/88900815484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3efa8727-779f-4547-9a62-1f22349d5209/chicago_style_in_text_citations.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/75734970929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19d9bb04-5769-43c6-80f9-16b613093294/allison_2000_transmission_troubleshooting_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/wekuvokamaserolunutigu.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/mafoseruranasapudovefado.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/what_is_a_sweet_wine_for_beginners.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_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 4952 bytes
SHA-256: 0e17964a536d0b592cc25f4a33ef09cda139269d19f1a59713af5ce4a7b9183e
font_01_sfnt_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 11176 bytes
SHA-256: c61eafd28a8587d7f79713ddb29a61b16c5e31c6fb51ca6f6cd646611759d3f1
font_02_sfnt_off000127f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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