Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac21f48701542d3b…

MALICIOUS

PDF

89.1 KB Created: 2021-03-03 02:26:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3893bb5a1db03f23852ad4b1195583a8 SHA-1: 5af284cee1a2c2fcfaca711597ccd9e0aefce747 SHA-256: ac21f48701542d3b4c549d6546b1d3aecaddaa06078c98c472dc17fb3e86343a
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. An external URI, https://soxebez.ru/123?utm_term=how+to+find+f%2528g%2528x%2529%2529+from+a+table, was found embedded within the document, suggesting it's used as a lure. The presence of embedded URLs and the overall detection by security tools point towards a phishing or malware delivery attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://soxebez.ru/123?utm_term=how+to+find+f%2528g%2528x%2529%2529+from+a+table PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378379/normal_5fd61f52c3c01.pdfIn PDF document text
    • https://cdn.sqhk.co/zesunotu/egezhcx/59965960593.pdfIn PDF document text
    • https://cdn.sqhk.co/telapunojawu/9NibYgj/77277337216.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/jggapjc/begita.pdfIn PDF document text
    • https://cdn.sqhk.co/xujurovemu/hhhhchd/41661737167.pdfIn PDF document text
    • http://mujoxoluvisukid.getenjoyment.net/rupufinaredodukugo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529087/normal_6027063536f58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425917/normal_5ffce35ddcc03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403557/normal_603eafa59e2a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501204/normal_602a79cbbdc0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443824/normal_5fedf594a4a11.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/zoromexemuzid/48286993195.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/14054599391.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/retinoblastoma_genetics.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/what_does_ptc_cust_rollover_ira_fbo_mean.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 5464 bytes
SHA-256: 93557fa7c6aea4092f9544ed193467a5615b7e315b9479d47b5d1d39ce32a11f
font_01_sfnt_off00011a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6A 11496 bytes
SHA-256: cea234bdd2ee375ce847fc69d4cce5bac7b6fd841a2cdddeb139211ceac66f9d
font_02_sfnt_off000141d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D4 16236 bytes
SHA-256: 30f7147ce4257634919d893d3a36599c2b4e153294648ff57363fa1d20ef004f

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