Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a405496a2927fb…

MALICIOUS

PDF

96.6 KB Created: 2021-03-23 20:57:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f4375bc34ba35747d766122d5e78c949 SHA-1: 0c2517870ee28ed48d20b361beded37f8799538d SHA-256: 79a405496a2927fb3343d54ad4baab85e65a63d7d680d41d6c6fac389ac5e0ac
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 ML classifier also strongly flagged this PDF as malicious. The embedded URL heuristic confirms the presence of a link within the document body, which is likely intended to direct the user to malicious infrastructure for phishing or further payload delivery.

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=rosencrantz+and+guildenstern+are+dead+summary+act+2 In PDF document text
    • http://tugrull.com/90044465599zczgh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404290/normal_60241b4f92f1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_602274f5d8218.pdfIn PDF document text
    • http://sellamorem.com/95268572233ezf29.pdfIn PDF document text
    • http://roman-holidays.shop/96632026631msspd.pdfIn PDF document text
    • http://podeves.xyz/joker_script_murray_show7tdig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386824/normal_600a58f9ce720.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/8cee9808-4c30-4978-8f8a-3af176b00160/91250711537.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/joxoluwofebotak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62419e48-f000-4ab4-8b83-186ad0bc985a/mazirozerere.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/diagramming_sentences_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/48491936753.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/pokemon_black_white_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/40178262920.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/3007454175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/441022bd-59b6-48b0-b97e-dd1974c303a0/88454550419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f797eb4c-2704-4f65-8261-2f884889dd47/28284003258.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/rezafeve.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/impact_assessment_template_project_management.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_off00012ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCD 5432 bytes
SHA-256: b73d439c7e1ad55861c9dfab56e744ca74bb01ae0daee3fadc99b6fee098943b
font_01_sfnt_off00013f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F37 11700 bytes
SHA-256: d6eafe5dd86083a70c91044e4736717c60b1db8464297d962df40f158a297db8
font_02_sfnt_off00016690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16690 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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