Malicious PDF — malware analysis report

Static analysis result for SHA-256 b890bc5ae4e581b1…

MALICIOUS

PDF

68.0 KB Created: 2020-12-15 04:08:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 8c6e7c36d8b43c4f03bd83920a3a9218 SHA-1: 835b6a42403d295cb77ce906b7965621f753a774 SHA-256: b890bc5ae4e581b1d60b7f27b4ddcbe05745a289affed50bb824a95d19d13e21
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, and ML classifiers strongly indicate maliciousness. The presence of a download button heuristic further supports a malicious intent to trick the user into navigating to a harmful URL. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/123?utm_term=chip+bag+template+cricut+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4499317/normal_5fbbe6aa9b681.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/8722cecc-424d-4135-a873-7afb009e6870/hl-2270dw_manual_feed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d283b3f-b289-44c5-adf3-018a47261da2/8094665435.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/employment_letter_for_spouse_visa_template.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf519c1972c46e3c958115/1606373790167/xifibawijuta.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/gowedawixoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/287dffc7-fdec-426b-ae8f-31bf5184c1c5/19078068208.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef06d68e-7d8e-49b2-8e79-f8338536b156/75667564777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31087b56-f5d2-4975-9740-f6504e67b703/avusd_apple_valley.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6496268612547ed82b646/t/5fd0ec7f337d9179bd5ba73d/1607527553574/38213587857.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B6 5296 bytes
SHA-256: 79700a741def68d5e5c7ac9b1556e07737af2357a681aa91073e1645c60d7b18
font_01_sfnt_off0000d588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD588 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000de16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE16 10756 bytes
SHA-256: 54808cc302ff3c0d03cb4bd1eb4d783694160828474e38043c17bd89661eeece

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