Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d3f3aa0d072519…

MALICIOUS

PDF

64.5 KB Created: 2021-01-02 03:22:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 80e72f1ef37f4f8c76ccc172d0a55181 SHA-1: eafe173c7253da1f3cc71e118100876224a307f4 SHA-256: b8d3f3aa0d072519f966e7fd59e27c292de21d7b865982e48ad116c28c3d35c4
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to redirector infrastructure, with one specifically identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a summary of 'The treasure of lemon brown pdf', likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/123?utm_term=the+treasure+of+lemon+brown+summary+pdf In PDF document text
    • https://cdn.sqhk.co/pibegufuxova/tigUgdu/closest_ice_cream_shop_near_us.pdfIn PDF document text
    • https://midazumetewafaj.weebly.com/uploads/1/3/4/2/134266273/9726703.pdfIn PDF document text
    • https://vepezifu.weebly.com/uploads/1/3/4/2/134265798/b0f7fa001b5.pdfIn PDF document text
    • https://cdn.sqhk.co/mepofazobi/hcbgcMl/father_and_son_presidents_of_us.pdfIn PDF document text
    • https://soxupewo.weebly.com/uploads/1/3/4/3/134392520/5da287.pdfIn PDF document text
    • https://tiguxenejizowi.weebly.com/uploads/1/3/4/8/134899735/1782845.pdfIn PDF document text
    • https://jupimoxojufe.weebly.com/uploads/1/3/4/8/134860775/tedazefalasovimotiri.pdfIn PDF document text
    • https://wibagubid.weebly.com/uploads/1/3/4/3/134373733/80cf0667.pdfIn PDF document text
    • https://komakuzafoge.weebly.com/uploads/1/3/4/5/134576335/1594329.pdfIn PDF document text
    • https://filogeruziwumu.weebly.com/uploads/1/3/1/4/131406947/fotinipuvijivodemo.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/pilazi/auto_games_apkpure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18f67d63-bd48-4a46-928c-58b28d8e0022/computer_science_ucf_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/wuzixiwujafidovuboj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0793b259-8913-4337-b301-4e2ab7bc399c/jovum.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_off0000c1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EE 5564 bytes
SHA-256: 2fc8c1010110d1ec176babfcb80ffcbbe774cda7eb42dd6aa90fbce0fd0734ae
font_01_sfnt_off0000d4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BE 9500 bytes
SHA-256: a6c829a00cc61ab02805ac762f451dfac96019f7cae531c333244d037fa31d59

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