Malicious PDF — malware analysis report

Static analysis result for SHA-256 4111b8a3066f6f8f…

MALICIOUS

PDF

74.3 KB Created: 2020-12-20 05:27:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5ea97670f68588c0446f4e18cb3a19ab SHA-1: 8afe9b3cf23baa620fa0612f988cf0d8f2bef1ef SHA-256: 4111b8a3066f6f8f195b7a30277f448d860e48ed146859d34487e86c02bed818
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or phishing attempt. The primary malicious URL identified is traffnew.ru, which is likely used to host a second-stage payload or redirect to a phishing site. The ClamAV detection and ML classifier strongly indicate malicious intent.

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://traffnew.ru/strik?utm_term=what+is+system+analysis+and+evaluation PDF link annotation
    • https://jigaxokere.weebly.com/uploads/1/3/4/6/134622899/sijerisab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_5fba5067b7043.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427523/normal_5fd18bda9e4d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404741/normal_5fa0dd213bf83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478968/normal_5fc87e2427d9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467277/normal_5fdb64807a820.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444096/normal_5fba2f9ca9d5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5fd679a63a880.pdfIn PDF document text
    • https://lujotovarox.weebly.com/uploads/1/3/4/8/134888889/4534393.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381551/normal_5fcb499308a18.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/3cd551b0-2714-4d1d-ac27-98c4edf432d6/71099949697.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc70ec7a4d75e5252f2a30b/t/5fd6f630ffab5d3c560fadb2/1607923249669/xojebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d4c6fcb-a36a-4eeb-a835-78d2fbbe6622/zorovababulugezugiwinozaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5e39666-163a-448b-b83b-8b1c1ccde69c/niwigavawamipiwuzufisisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daeab4a5-ebb1-43f8-ad96-21fba166bc80/21742067472.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

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_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 5144 bytes
SHA-256: 8c94a98dfeeb02b9e80946333bd0b88398ae5d996f080444cdd9d3ed0a69e91b
font_01_sfnt_off0000fa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 10232 bytes
SHA-256: b51f1b2682241e8461fdd54b462c2240d93485676f459488affd91a48b89d7d1

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