Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d095ccf544d9673…

MALICIOUS

PDF

73.7 KB Created: 2021-04-05 06:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e5bf84ecb197dbb0177eb941708ccd37 SHA-1: 2457a1403efa2c663fb63a2d422adc359d11dc5c SHA-256: 8d095ccf544d967368f605ff7710ce709933984c63d206c22d1b11a2a49ecd17
186 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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/123?utm_term=b+s+t+c+form+last+date PDF link annotation
    • http://moscowflowers.online/is_seafood_haram84flx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490918/normal_5ff9d5f799080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412151/normal_6056af52869ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465908/normal_603a93f9710bd.pdfIn PDF document text
    • http://kernig.pro/kekeletamujukivezscarx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458615/normal_5ff5c78965caa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487416/normal_600fb48950679.pdfIn PDF document text
    • http://matrixbicycles.com/25592503581tmw64.pdfIn PDF document text
    • http://fb-ig-copyright.com/68493967721xe7w8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413347/normal_5fd03ccde7b52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_6048f3af088b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418778/normal_5ffe4a16c797e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393506/normal_6039badd24cb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422914/normal_6066246b09463.pdfIn PDF document text
    • http://lasleymarkt.ru/refovifazuvaganuvikh4hi0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_2205d23f432247a0a526e625868e92b5.pdf?index=trueIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_92c4785b160b483f8d8c292e7022db70.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 5216 bytes
SHA-256: 79d07d986bf35534d7fc8350719aa7eb6eb57c56df83a63156e30d6c3f4c38f4
font_01_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 10556 bytes
SHA-256: 4340ba441179f55f4c77ac4227f0d6b9b868d6b8e3cd6ad2c00b596a7c44ad61

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