Malicious PDF — malware analysis report

Static analysis result for SHA-256 4810252dbf8fcb5f…

MALICIOUS

PDF

81.5 KB Created: 2021-01-20 12:53:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 39d152f1942fa697907c60d6a3f6408c SHA-1: e9bf65f4feadf309705764e5be06708ee488544e SHA-256: 4810252dbf8fcb5f98c95b705857915d0b1dc253b5dec52cfaa7943f30615222
116 Risk Score

Malware Insights

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

The PDF contains a malformed stream and an embedded URI, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan PDF. The embedded URL is the primary indicator of a malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/123?utm_term=general+power+rule+integration PDF link annotation
    • https://site-1201991.mozfiles.com/files/1201991/26390267814.pdfIn PDF document text
    • https://cdn.sqhk.co/disegivoji/6U2ifTc/34120517821.pdfIn PDF document text
    • https://site-1177244.mozfiles.com/files/1177244/vefikawisavawezo.pdfIn PDF document text
    • http://zinobinipote.22web.org/letter_c_worksheets_for_2_year_olds.pdfIn PDF document text
    • https://site-1172701.mozfiles.com/files/1172701/juneforuxunavokirefuri.pdfIn PDF document text
    • https://site-1175575.mozfiles.com/files/1175575/jixofiduzewog.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/jozetej/22654205178.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/shawn_mendes_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/471106757.pdfIn PDF document text
    • http://savagit.rf.gd/72441654753.pdfIn PDF document text
    • http://posugez.epizy.com/88420531626.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/cnpc_annual_report_2018.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 4932 bytes
SHA-256: b2246b5d895291ac96a8b342ea7fcb07df8a71992b9353a7fa31ec3afc8d1ccf
font_01_sfnt_off0000fd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 6460 bytes
SHA-256: ed2b8b4deaa7d20aa4bc2e726ca075fb8ff6006857ae2b97d71affc4ea584670
font_02_sfnt_off00010cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF4 13496 bytes
SHA-256: 19c2e2d93ff58e4e54b90f018c54cf6395ca4f2aa45a41279bf8046de78edb92

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