Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b8090e48ccf86b…

MALICIOUS

PDF

100.4 KB Created: 2020-12-26 13:52:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cd21a5b225cd40fedc9ffec5025ed67a SHA-1: 10f9b78a517f5e5c7ef61f60b988c2bbc08a3222 SHA-256: 77b8090e48ccf86b04d2d1e2caf0331edfb3292b6d6484eafdab08eac56a04ff
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-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://traffking.ru/123?utm_term=crash+and+bernstein+jasmine PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422918/normal_5f9c65e789277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5f8aa6523f0ea.pdfIn PDF document text
    • https://xugojegisonixen.weebly.com/uploads/1/3/4/6/134684264/58c1c72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406463/normal_5fdef7b657945.pdfIn PDF document text
    • https://paninopuj.weebly.com/uploads/1/3/0/7/130739529/15db8c0eb00edb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470688/normal_5fb9855d774ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5fdc1a63a82ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478923/normal_5fcbb50b19c0c.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/8be1aec2-3a8d-4086-9250-1dcee39958ca/disco_bowling_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e41649d-d498-4751-aee3-d2f8a1011973/they_live_mask_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/ethnography_sociology.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE6 4948 bytes
SHA-256: 23daa0271421e008f3ea170dee1a95e9d7458b73b124d4fa6cf4f3ea74a16769
font_01_sfnt_off00014f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F81 11340 bytes
SHA-256: e6672d4a61fb4a3db5b5afc68bda12887b145ac09d0ba8bd54b0907cf4b9ecf7
font_02_sfnt_off0001750f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1750F 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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