Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e25ae6d92944d7d…

MALICIOUS

PDF

81.0 KB Created: 2021-03-02 08:55:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ca9edaede6c9cfd6b7495468712e46e9 SHA-1: 917df311776177df05e4e3cd4f3d9f893c6d82fb SHA-256: 5e25ae6d92944d7d70003e34e6540f1afb7b93227c887fe4b5c0d890208af62e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically 'https://dafemum.ru/wix?keyword=moff+jerjerrod+lego'. ClamAV also detected it as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of malicious URLs and the nature of the heuristics suggest a phishing or malware delivery attempt, likely initiated via spearphishing.

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/wix?keyword=moff+jerjerrod+lego In PDF document text
    • https://cdn.sqhk.co/setinapas/K6hdIhe/bike_racing_mania_mod_apk_download.pdfIn PDF document text
    • http://albatros-trans.ru/fruits_and_vegetables_having_vitamin_dwbhm3.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/what_naturally_kills_parasites.pdfIn PDF document text
    • http://giwitijudaleka.mygamesonline.org/13332985548.pdfIn PDF document text
    • http://zomolejefej.mywebcommunity.org/lirumorapadasitapaxivo.pdfIn PDF document text
    • http://kengoru.space/nadan_pattukal_malayalam_mp3_free_do1yna7.pdfIn PDF document text
    • http://manuximaxemeje.scienceontheweb.net/how_to_program_motorola_walkie_talkie.pdfIn PDF document text
    • http://ecoservice-vlad.ru/kipotevigomekih1fnx.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/jevopemosod/overtime_pay_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/dugikedo.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/juluwowojikizi.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/duperipemeworozube.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/legozabeporux.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/kannada_sad_feeling_audio_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/500_most_common_words_in_english_anlam.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/69759688664.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/wokudexiwidogajo.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_off00010321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 4768 bytes
SHA-256: 42c0174297ff075132f4ffa52d748847a54b1849300b0cb1f74819e4e992e8db
font_01_sfnt_off0001137c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137C 10408 bytes
SHA-256: d5cf7fc59267f73be624b23cf833fbe5f6e60e49a392616f717fa96410099b8f

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