Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee4b9b2fa747f06…

MALICIOUS

PDF

76.2 KB Created: 2021-03-23 01:02:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f1bacb69bfcfbe9854e9aa4f72749287 SHA-1: 57a45d9aa71ad6e9b2c570ecf35096c7194f493a SHA-256: 3ee4b9b2fa747f06a1397c692cc125879d0c15ba4b6b1307e88e2d3cf66858e8
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-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://dafemum.ru/award?keyword=cesare+pavese+paesi+tuoi+pdf PDF link annotation
    • https://cdn.sqhk.co/zojixemem/hpYhgCJ/big_button_launcher_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406464/normal_5fe597fccf49e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368998/normal_600fd5a0cc4f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425909/normal_6041162a19a20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458833/normal_5febe7c2b2cf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408335/normal_600b7456349f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481667/normal_5ff8f92811b44.pdfIn PDF document text
    • https://cdn.sqhk.co/minederepa/twjeYBH/download_directv_app_on_smart_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/zWWxiiA/34754987190.pdfIn PDF document text
    • https://cdn.sqhk.co/sategexarom/ahfFVhe/64545788784.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/the2jfj/management_synonym_resume.pdfIn PDF document text
    • https://cdn.sqhk.co/luvunugoz/ajbih44/spices_hut_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/gM1njbF/90155662006.pdfIn PDF document text
    • https://cdn.sqhk.co/zonigita/dhihiwI/salezovaloxesoje.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/mukut/5997902561.pdfIn PDF document text
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_8ae7a1d1e10c4505a88a475aa12be734.pdf?index=trueIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_74754aa328f84893bfbb97b04b5cec66.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/how_to_practice_wing_chun_without_a_dummy.pdfIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_36f46bc31f454fc8a56691efa19afaef.pdf?index=trueIn 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_off0000ee82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 4968 bytes
SHA-256: 010c88352d491ba60f7d34f623ce5b611761b824dfb34f14d5cabf220c7fc5fb
font_01_sfnt_off0000ff7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7C 11352 bytes
SHA-256: 88de033a12485344452d8756d22860485d7421065f5c00c543f544922609cc98

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