Malicious PDF — malware analysis report

Static analysis result for SHA-256 b598fd24704d90d0…

MALICIOUS

PDF

74.7 KB Created: 2020-11-19 06:29:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 19876134c4081285d7350ec60a8d1d2a SHA-1: df98add0ccec7b97a61eddf3ba77016bff4bc814 SHA-256: b598fd24704d90d03153fe4f91a681138ad37fc7c56e7e41613b304150472610
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://trafffi.ru/strik?utm_term=victoria+beckham+size+chart+target PDF link annotation
    • https://benokonafininu.weebly.com/uploads/1/3/4/6/134606635/gavojil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385038/normal_5fb59e322f238.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5fa8f23cc6f8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408330/normal_5fa275943863e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369922/normal_5f90a1d876592.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474218/normal_5fb5880eda42b.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/17e56ec3-c0c6-4a61-aaab-17621e33b5b9/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b8d0c91-6b90-47ef-8bec-0a1f03eaebb0/sC4B1vC4B1larC4B1n_basC4B1nC3A7_kuvveti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac5b2edc-4890-4841-8fb6-4837b4251948/25557626973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b950b3ae-98a5-4989-9892-aecd6ea42df6/user_manual_for_apple_watch_series_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85509ffd-a144-4578-8f2a-5f8a002b445a/legoland_california_map_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2e96355-b5a7-4ec8-9509-cf6e72d4a481/mirag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2deb9f6-b4ff-42c4-904d-bbba7c7613fb/peferafewolax.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB26 5400 bytes
SHA-256: 89c2dd9260de6165e0bf513a1a4b3e249df749dd5eb1bf76e9d2f317287ae5cf
font_01_sfnt_off0000dd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6B 11268 bytes
SHA-256: e01d717593ce8122af80628172746232b2ff852ee60114e2e380fd638eb0dd0e
font_02_sfnt_off00010450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 17484 bytes
SHA-256: f208de675c0776b23d4783ea781812bdd0b980dd9b5e2c11c1f6b1e1f9f268ff

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