Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca540df5bea1a737…

MALICIOUS

PDF

58.3 KB Created: 2020-12-01 00:16:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 9b7ca40f33080cd6dd4c08190a86ee6c SHA-1: b803b835af3c6308ad9d33192055ce8ff21c7ab1 SHA-256: ca540df5bea1a737ed72b3e44d49a712af5259530167d13034e21219a76df86d
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 0.9996

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
  • 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/123?utm_term=50+tons+de+cinza+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420600/normal_5f9711a6beadf.pdfIn PDF document text
    • https://pinuzika.weebly.com/uploads/1/3/4/6/134640149/muzafemu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418796/normal_5fbd7e4d536fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494888/normal_5fb4937bb38e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378390/normal_5fa11349a80c3.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/kavalukato/week_8_secret_banner_fortnite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ebcf8a1-582c-4738-9c30-92c6e51592f8/23288677814.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/kimuwirujutipuvakateniv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8ed33c-0294-442b-ba69-02a39f3d484b/disturbed_the_game_live.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/63314739498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24b96b3c-52ea-44b8-bc98-3beb6374a292/breastfeeding_answers_made_simple.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/download_skype_app_for_kindle_fire_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/bizijoririrokupugofuwod.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/65349843651.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/corporate_meeting_meme_template.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_off0000aacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAACC 5244 bytes
SHA-256: fe5098c94e2ad45700627af3349c2fd5cf95880c299524b05b4f2c1d0e7483a0
font_01_sfnt_off0000bcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC6 9640 bytes
SHA-256: 9f455e389baa1e0dba302b48908785dd983e92e4d7d2998852ef496cd4b9dae3

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