Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c540b81e19490e…

MALICIOUS

PDF

78.8 KB Created: 2020-11-27 06:13:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d5e6f9542a418250e7703a2fc7369b74 SHA-1: 977c75fc86437863904c68d5b10b7d770323c0f7 SHA-256: 80c540b81e19490e3f6bdd20afb900b39bf7a58a559158a7801da96a9d7f8932
156 Risk Score

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 0.9997

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://trafftec.ru/123?utm_term=keurig+2.0+carafe+hack PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376621/normal_5f8f60e81a1d4.pdfIn PDF document text
    • https://fugiweritukasuj.weebly.com/uploads/1/3/4/6/134682589/a696816069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403541/normal_5fa4c5679ca62.pdfIn PDF document text
    • https://dowikonusinewe.weebly.com/uploads/1/3/4/3/134374018/sawarenexowazaxifo.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/wixanarer/21387267543.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/fnaf_1_camera_picture.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/lukapuburil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e18b2ab-3c8a-47f2-a435-325c5a02fe38/jarun.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/how_to_be_a_modder_on_gta_5_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/pezominin.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/34073300922.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_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 5272 bytes
SHA-256: 5351977c750f33c2cc53d140adf4aa04910949170c6b649685d04da68527da10
font_01_sfnt_off000105f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F6 11556 bytes
SHA-256: b626b4fc1100eec8451e6453c414d69c4b4ad0704a1eec5499e9bd2fddad1d01