Malicious PDF — malware analysis report

Static analysis result for SHA-256 992a51455e8cded9…

MALICIOUS

PDF

65.3 KB Created: 2020-11-25 00:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b3529d02114f29b9a9afa8207f922c93 SHA-1: 5c4d28e9f1ecb38440ca7d2951537bbae2fe11f8 SHA-256: 992a51455e8cded97e8c7f4ca771dff5d8810bf23d229ff16c34cf79448f6c5f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=emiway+songs++mp4 PDF link annotation
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/pukofurul_nowitadim.pdfIn PDF document text
    • https://rudanivaxaf.weebly.com/uploads/1/3/4/4/134497940/fc587eacaa39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_5f9c41fc182f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376866/normal_5f8a10fd2f209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450634/normal_5f9fa3123bb15.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/murimewadolofis.pdfIn PDF document text
    • https://gebigimudixerez.weebly.com/uploads/1/3/4/3/134374499/piwixezop.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/56e1f3c7-04fc-4ca5-b184-1e3755aabdb8/21454659130.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/putapuwagulotafimexij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3104040-77b4-4d30-8297-489817fe7d68/microcontrolador_pic16f84_desarrollo_de_proyectos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/510e6d09-2f46-449f-9847-efe7811a1f8b/iptv_smarters_app_for_apple_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/454d9237-848e-40e6-83a9-8a579e4e5e82/9_noble_virtues_in_eldar_fulkerth.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_off0000c3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C7 5252 bytes
SHA-256: 74a3fd6e80fd66574c1e4a272a5ce45e31d7a12c83c3401ab61b874e6f5d54d7
font_01_sfnt_off0000d5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BD 10380 bytes
SHA-256: 15fa7e78391d06db733915d57bb733ef2b4ec776bcbd7ac763bf4577502faeb4

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