Malicious PDF — malware analysis report

Static analysis result for SHA-256 88930b07f148ce8f…

MALICIOUS

PDF

90.1 KB Created: 2021-06-07 09:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 343af7597eacc5d9cd3ad4e27b70e701 SHA-1: 3ca8a7ce8c9a10cb8dd69b581ff9baab5cc7d63d SHA-256: 88930b07f148ce8f844635dec4ad65c0db95000e18cff8ec92e90d06a3fc27fc
96 Risk Score

Malware Insights

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

The PDF file contains a lure related to an 'answer key' and embeds a URL that likely leads to a phishing or malware download site. ClamAV detection and ML classification strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/123?utm_term=acls+post+test+answer+key+2018+quizlet PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4453741/normal_60b3dd09a2deb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489245/normal_5fc845e6c9599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445334/normal_606e5f2334e96.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4459036/normal_60b4ed9f60fbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401697/normal_5fee9f44c1db3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472495/normal_6052800b87205.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402501/normal_5fe74f74a37bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482849/normal_604d1133bda5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487424/normal_6001c52cd31d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376610/normal_602ea89cd21ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473619/normal_60268f3fe6fd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464710/normal_602428a0bba95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413701/normal_6048a51bcceb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480403/normal_5fe662efa43af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499935/normal_604506efa27dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464862/normal_5fefbe69da82f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444092/normal_6030aad1acdfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462993/normal_60506c602c0d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391331/normal_5ffa2bdd7bec3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417986/normal_5fdb0bea2a717.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bujolajoxek.pbworks.com/f/income_limit_to_qualify_for_medicaid_in_ky.pdfIn PDF document text
    • http://fujiserefi.pbworks.com/f/minna_no_nihongo_shokyu_1_espaol.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_off00011f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F71 5868 bytes
SHA-256: 037e59849ca5ff31d8c541d461eef08e787f384426b3a06766030437a2ac6db4
font_01_sfnt_off000133a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A6 11716 bytes
SHA-256: 613741edf9fa7107c707711f22e3bb14bf66332f93fe018fda8bb790a5bc75b1

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