Malicious PDF — malware analysis report

Static analysis result for SHA-256 07aed883e2f236ce…

MALICIOUS

PDF

80.4 KB Created: 2021-02-15 01:41:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 777d9271abb6c1051235dbb907ad70a1 SHA-1: ec6487615493685903bdbb06bd17d2e45cf74e3d SHA-256: 07aed883e2f236cea54b4a58b0b54cd100067fa4063d16b24738f2b7435e0a78
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by a ClamAV signature and an ML classifier. It contains an embedded URI pointing to 'https://jacksth.ru/aws?utm_term=close+up+b1+test+unit+2+worksheets', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'worksheets' and the authoring application 'wkhtmltopdf', which could be used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/aws?utm_term=close+up+b1+test+unit+2+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427519/normal_6027ee40674fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410415/normal_5fe054104060a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_601f80faa92a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446390/normal_5fe401f121d1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464083/normal_5ff4e1652a3fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476946/normal_601a637e26fc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479916/normal_5fe8ed8b6fdf4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383698/normal_5fccf65d88f25.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/new_tamil_movies_2019_marina_rockers.pdfIn PDF document text
    • http://gusizozubamu.epizy.com/sesopepon.pdfIn PDF document text
    • http://bumilofu.rf.gd/sitatenib.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 2172 bytes
SHA-256: b666a812467dc1c97c79e6ae5db4cd466d06b83f65f7373b3560ed4293153035
font_01_sfnt_off0000e4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E0 5080 bytes
SHA-256: ac8de6bf1c8fb07584b7df1548626772285493bc10c4315c340c859633a9de25
font_02_sfnt_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 12216 bytes
SHA-256: d34a9607ba3584d3bbc1d0703dc19a11c560c61665ac5c553f76145a53ec9d0a
font_03_sfnt_off00011e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E81 16188 bytes
SHA-256: cf6ce86fd7a40b8faabd454cc8fed84ff4645fb4e830019ed73c90cf8815c83b

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