Malicious PDF — malware analysis report

Static analysis result for SHA-256 959f6f4c9432165a…

MALICIOUS

PDF

66.0 KB Created: 2020-12-08 14:59:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 47dc9c6c9b16a4a5476a6c525abc51d2 SHA-1: d3602eba8690c4ceaa769e8b34aa4ab74f8b4584 SHA-256: 959f6f4c9432165afd3518f5c769d8eba80b5ba6ceac12f0b90827a4dda975ba
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated, but the presence of links and the heuristic firings point to a malicious redirection scheme.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=fruitland+middle+school In PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/c1658fc589.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/874783a0-055b-4916-8064-1ed32d8217ef/into_space_2_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2622126d-1d18-4cec-9007-8c1afbeceafa/37398262467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d19b317a-0f21-4333-87e9-de4b4c3da058/all_cheerleaders_die_2014.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/action_bollywood_movies_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3151895c-1def-48ac-82d1-5254fe4d98fc/las_3_preguntas_jorge_bucay_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce1df31c-6265-4d1c-be93-f235ef17a4bd/14283438575.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/nozemabevoxugegisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82aa69e5-9583-416a-b394-c07be25f54ac/56585331543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/255e5105-e46c-4793-843d-7e0a3424e549/40837130503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/113a2315-da4e-4e0f-b26b-43f2362f0cb8/81159972570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d7e701-1698-4834-a6f7-419cac4c7f2a/nixojuzimekanezuximi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23ac0a24-ac98-4d4f-8d6b-ee5053d32f1b/rimon.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_off0000c88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88C 5136 bytes
SHA-256: d77ba9ac05f3500ebc6b2cbb423c6c9963bba1872cce5df2f52a273b4a0080a4
font_01_sfnt_off0000d9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 9908 bytes
SHA-256: d01a29dd122524ad2c66ef57f7de07b55ba1b31c5d19cc079059d381d699235c

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