Malicious PDF — malware analysis report

Static analysis result for SHA-256 931c1e30174a187b…

MALICIOUS

PDF

77.3 KB Created: 2020-11-29 17:18:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 94e3ca3ef32a4d12e3273bdc1f89bb2f SHA-1: d421d330607b098f0c85f799996a80e62affb3ec SHA-256: 931c1e30174a187b1925b2c14aaae5d4c8dd8d53972dbc4aed911f0b6b3bcd12
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One prominent URL, https://traffnew.ru/123?utm_term=we+are+legion+we+are+bob+epub, is directly embedded and likely serves as a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or SEO spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffnew.ru/123?utm_term=we+are+legion+we+are+bob+epub PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459185/normal_5fbdf1f0cda6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368746/normal_5fa76c2d474d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_5f8b44181e2b1.pdfIn PDF document text
    • https://saferuwakuzav.weebly.com/uploads/1/3/4/6/134688645/jupupowupukutig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/40c673ea-599f-4ceb-a7ab-ff1234f592ee/77513542904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aeebe0c-1fd6-4050-b069-308cffc314ef/gizmo_answer_key_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/872b41f3-10a1-4d7e-8e50-032ac166c8e0/11224550140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8df7b1-039c-46e2-88b3-574069168881/figidepelodoben.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2852e2aa-1491-47b7-8f2d-f6c8c6ceefc5/21611864904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3749fe0f-dd71-4a98-9ec5-94e9a3dcf68e/6590801511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf604e2-0cad-4a7b-9858-ea505329a331/66608672682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/458ab9f1-2f89-4c40-930d-505ab71c05c8/58813584854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fcc79b3-de26-49ca-995a-da9c24eb2b6d/marikegep.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD138 4856 bytes
SHA-256: d8845bd598548b79566d149d297cc75b2faf85c307e62d70f4ef59663cebc9db
font_01_sfnt_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 10420 bytes
SHA-256: fb94c2f49563246c3822a922bb625b248b882e7a1fe389660943d8a5c07970d4
font_02_sfnt_off00010575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10575 16060 bytes
SHA-256: 0d2cf29b13ffe7e42e9984e6c191618c7dc34d08b3b68ffdc6e305960fb7475f
font_03_sfnt_off00011a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A08 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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