Malicious PDF — malware analysis report

Static analysis result for SHA-256 2781ca51a4f57edc…

MALICIOUS

PDF

79.1 KB Created: 2021-02-14 17:32:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5ee5799a943d609016f42ffc772b6268 SHA-1: 4a9d3b851d900d364b8214630cdf40bdfb1bdf0b SHA-256: 2781ca51a4f57edccacd04a660756b6e85e2bf03dd2b1b435693943c9dc4abd4
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to a phishing URL, disguised as a gift card balance check. The ML classifier and ClamAV also flagged this PDF as malicious. Although no scripts were explicitly extracted, the PDF structure and embedded URL suggest it's designed to redirect users to a malicious site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/123?utm_term=food+lion+gift+card+balance In PDF document text
    • http://netewe5.xyz/cbse_science_book_class_67bgda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_600f305129b73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448991/normal_5feb4194992fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411483/normal_6018716d210bd.pdfIn PDF document text
    • http://smallita.space/total_conquest_java_game_free_download4zbwr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493195/normal_5fdd851972d34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424024/normal_5fcd3cce9df58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448545/normal_5fed807deab6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460447/normal_5fcf118e5e62b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366337/normal_5fd0848da8470.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476750/normal_6000cb773e8d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_6016f05b621ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501659/normal_5fef55c2ee411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_6018db715ccb6.pdfIn PDF document text
    • http://pedron.fun/reported_speech_sentence_transformation_caebswu0.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/zuwimadaneb/manual_impressora_bematech_4200_th.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/homonyms_homophones_homographs_quiz_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/17087364578.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/game_black_friday_catalogue_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/in_search_of_fellini_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/android_phone_version_6._0.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/petimewusawidexi.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_off0000f894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF894 5108 bytes
SHA-256: 5d7c17a66ea2bec4d9f0f13443a247481cb8ab60c427d6990d98187537be0efd
font_01_sfnt_off00010a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 10748 bytes
SHA-256: 0f374f625b12e0d5bc3c98cd9feded6ac8f41a131d35a755f32989a5435e61a5

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