Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf490a66750b9ee8…

MALICIOUS

PDF

76.0 KB Created: 2021-06-12 19:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 05679bdf0ddbc60fbf83786035929a6e SHA-1: 4be924d2f209ae416e22cdffecbc97264742d6be SHA-256: bf490a66750b9ee88d2a7100825bac9f8dfed7a964296a862c00683325ea8a39
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to 'https://pistant.ru/pbw?utm_term=narration+exercise+with+answers', which is likely the lure for the phishing attempt. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the detection suggest it's designed to redirect users to a malicious site, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pistant.ru/pbw?utm_term=narration+exercise+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446645/normal_60bea292cd072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382780/normal_5fd2d948b577c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401972/normal_6042f6ed69d48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445129/normal_6010204cb7cea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446273/normal_5fe8f000b1480.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481676/normal_5fc6bdb9a2d32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452148/normal_60113f661c8bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408989/normal_600bb212339ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418180/normal_60c2d330d8550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452608/normal_60342b5d44a14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470540/normal_6009141b737d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383916/normal_5fe1333eda939.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482618/normal_600bd00930704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408976/normal_60bf69f56dc03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e8c569-8079-4e0f-a574-66d773442e53/gopek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbc57f5d-153c-4adb-a55f-c201e06577ab/dog_man_unleashed_100_piece_puzzle.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_off0000ec56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 4984 bytes
SHA-256: 97354ee3704d7b16b0f56ed975c27ca98bcabad013d2a773b2a17266739f0d62
font_01_sfnt_off0000fd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 10764 bytes
SHA-256: da1bab0fc51ccb300a2fd257d494954c456571d6eff40cbf9e5c2c892fbf5882

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