Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c21477173412598…

MALICIOUS

PDF

77.7 KB Created: 2021-03-22 04:44:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: a146ba24b6e311e201f822781e1461e6 SHA-1: 964ec57bc51bf7e359fe4caad2e6f9db305e08bf SHA-256: 8c214771734125985046d4ac47cb50bd939961678c7e22d2f2610d69a506cc1d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/wix?keyword=hack+slash+crawl+wiki PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4494149/normal_5fee96ed18b0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427282/normal_600fa59d55e4d.pdfIn PDF document text
    • http://letuzenatapisos.iblogger.org/expediente_anunnaki_librojuego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401517/normal_602c4114eee45.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://uploads.strikinglycdn.com/files/18050c66-1f54-4ab7-8e38-f9bd3574b5b9/denon_avr_1612_subwoofer_setup.pdfIn PDF document text
    • http://vaxabusegaw.epizy.com/4944909884.pdfIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_94acfdd832924942a7131fdfe9d5c2d1.pdf?index=trueIn PDF document text
    • http://xibupafuvobiluk.rf.gd/23952180181.pdfIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_fc019a04659e40949358deff00644f3f.pdf?index=trueIn PDF document text
    • http://rifobotulaw.rf.gd/sharp_smart_tv_apps_hulu.pdfIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_026a28e06d044fb7bd35994c56fc7a35.pdf?index=trueIn PDF document text
    • http://jidojig.epizy.com/50232452823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b01a9364-9197-4c31-95c1-14a9a314ce34/38396596388.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d32a17ce-02a7-48e4-9620-5af5d30d35b1/ford_mustang_mach_e_interior_dimensions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5685eb4f-36a0-4d3d-8ea4-0ee4a727bca2/tovilakewozefibozajavamub.pdfIn PDF document text
    • http://fisejotigu.epizy.com/where_should_most_of_your_calories_come_from.pdfIn PDF document text
    • https://d6bf9bfb-c092-4b17-ab9f-91da83e6a9d2.filesusr.com/ugd/d7ad14_38aa0def50354430b3e8ed803e7ce454.pdf?index=trueIn PDF document text
    • http://vobewegogiz.rf.gd/38136379582.pdfIn PDF document text
    • http://robumesexix.rf.gd/tufavewitikabob.pdfIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_729acf4653d049e19ab617ed532da836.pdf?index=trueIn 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_off0000e7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A8 4380 bytes
SHA-256: dff8fd52960629895615cfd69dcd4151bbbe6e848d26817c1b7edacc2fbe4f95
font_01_sfnt_off0000f686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF686 10668 bytes
SHA-256: 298ec3a8d7e6f461788009278128db96f3299578ca33eb34a70a4dfccdc79d02
font_02_sfnt_off00011b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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