Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f7e7e3d33f0741…

MALICIOUS

PDF

75.3 KB Created: 2021-05-13 04:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c932c2017994c64a4d82835f80456c26 SHA-1: 22304536e50ad39606c083ed871d015191d91d0c SHA-256: 48f7e7e3d33f0741e57879706995a060064d4ae3bc85f517a1df52a87c534b06
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'. ML classification and ClamAV also flagged the file as malicious. While no scripts were explicitly extracted, the PDF structure and embedded malicious URL strongly suggest a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=psychoanalytic+theory+focuses+on+conscious+thought+patterns In PDF document text
    • https://cdn-cms.f-static.net/uploads/4469350/normal_603d02dc5f6ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_600fb0b53eec3.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/jcb_3dx_super_specification.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470038/normal_5fcb53bd37bba.pdfIn PDF document text
    • http://dusipoweg.mywebcommunity.org/29501936428.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466675/normal_5fde11b460448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468572/normal_600e36c36e165.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/baxunaf/38221558164.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/82289351278.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/dojofawemafobujo.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/zofetatexo.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/manjunatha_songs_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/couples_therapy_workbook_kathleen.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/61858695776.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/27335577721.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/still_blessed_the_perrys_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/sentences_worksheets_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/duzojirodukuzu.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_off0000e8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 5380 bytes
SHA-256: 4d841643a155c84d5f5b7133570c1e0b14b9823c5832aed8a071b9f8c1a81702
font_01_sfnt_off0000fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 10244 bytes
SHA-256: b5503e29dd53a63312bb3b075f1a862ad8a72075b3b0cb9ba0ebcbd0ac6ab657

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