Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a3e1591cd5b97c…

MALICIOUS

PDF

72.9 KB Created: 2021-02-22 10:53:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9fd19e35ab7a91fd676f7562e88c6c6d SHA-1: 4a21308f39cc2e130255c4ad2a9d03416cdc050d SHA-256: d4a3e1591cd5b97cf0133567d9ae7a3e762bd85f3da9fad7dc78dfa3f0ed2cbc
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is also flagged by ML classifiers and ClamAV. The document body, though heavily obfuscated, appears to be a lure related to search engine results. The embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/123?utm_term=how+long+to+cook+a+15lb+turkey+on+big+green+egg In PDF document text
    • https://static.s123-cdn-static.com/uploads/4381529/normal_5fe4ad072a003.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484995/normal_5fffd996372a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459478/normal_5fe2ad25472e1.pdfIn PDF document text
    • https://cdn.sqhk.co/kanedufopuma/JijzjcM/american_football_league_live_scores.pdfIn PDF document text
    • https://cdn.sqhk.co/lilodipu/bggidgj/nosofivejiruzu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382782/normal_5fe58e7c7631a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366024/normal_5fdb19a974496.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wegugus/oaic_ip_address_personal_information.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/83350027303.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/formative_assessment_anecdotal_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/84476383004.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/employee_attendance_tracker_excel_template_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/sheetrock_panel_lift_rental.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/4th_grade_math_word_problems_worksheets_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/30278988789.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_off0000e1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B0 5324 bytes
SHA-256: b712a825c3f40c448c5c05f38447bdc3215d4620f102d8ccef2dc2daa3260314
font_01_sfnt_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 10144 bytes
SHA-256: 8076b1b97d722abf311509b3cd35c0215ec6a49d114814b5bbe269f263910328

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