Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a91405dd67658b…

MALICIOUS

PDF

79.4 KB Created: 2021-03-28 21:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9b9dce179f4768b2c16b4e400ba00207 SHA-1: 69a3974b2ff3ff8b437e7fb3e23150fdce66e21e SHA-256: 65a91405dd67658b9827f54270662a006369cf7b8410f3b8a86f839881eb0925
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'dafemum.ru'. The document body, though heavily obfuscated, contains text related to math apps and wkhtmltopdf, suggesting a lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a phishing attempt designed to redirect users to malicious infrastructure.

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
  • 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.
  • 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://dafemum.ru/strik?utm_term=what%2527s+the+math+app+that+gives+you+answers In PDF document text
    • http://migerov.xyz/bcbsil_member_claim_formf2jbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455907/normal_60279ba3cc027.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393889/normal_5ffe6fe1d9190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402486/normal_5fd9582dd287d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486200/normal_60069aa4dcccb.pdfIn PDF document text
    • http://kdghy.online/716951066182ut6l.pdfIn PDF document text
    • http://pomanonorajalam.22web.org/blue_devils_dci_2019_uniforms.pdfIn PDF document text
    • http://fimuvukabiwijad.22web.org/79056689651.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/mojivikapeti/63683979085.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/795ef4cd-b47f-40a1-b6bc-86467f62b41a/varez.pdfIn PDF document text
    • http://dufosulux.epizy.com/calculus_art_of_problem_solving.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de3fe0e2-7eb5-46a1-bdcd-f01f03804963/5_minute_bot_nxt_2.0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1949945-2daa-4df9-b099-f03e9e279d6f/john_deere_l130_drive_belt_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/who_has_the_lowest_refinance_rates_today.pdfIn PDF document text
    • http://fotopokidag.epizy.com/kusesiluzume.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/33213679594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6549a0b1-ef32-4385-848f-080e2447ed3a/long_range_two_way_radios_for_sale.pdfIn PDF document text
    • http://kagexiju.rf.gd/puted.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/sesapo.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_off0000eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 5384 bytes
SHA-256: bb3ad9603378faaa5d64565f87f54f8294cc20fd6ece823626ecaa25caf0e8da
font_01_sfnt_off0000fd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD60 10876 bytes
SHA-256: 054b8c0742c87c0e19f3482bd7f8b0783d7908272fa98537016e6eee230a1820
font_02_sfnt_off0001223e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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