Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee4b0aa56fe66e9d…

MALICIOUS

PDF

74.5 KB Created: 2021-02-24 06:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 04a934f37d1f612f670f7acb5fae79bd SHA-1: 870bed9320ee4cf744341c8f5104f804a4e020f3 SHA-256: ee4b0aa56fe66e9dcb78106f0a51579fb7b61d77332b8f4e5c541fbd82ca5217
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to disposable hosting and a known malicious redirector. This indicates a phishing or scam attempt designed to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=how+to+adjust+forced+air+kerosene+heater In PDF document text
    • https://cdn-cms.f-static.net/uploads/4446264/normal_5fd92d1cd446b.pdfIn PDF document text
    • https://buwuxebukiz.weebly.com/uploads/1/3/1/6/131606134/pomonugoligeloru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427300/normal_601a01807795b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490519/normal_5ffb22cd479ff.pdfIn PDF document text
    • https://lojimosaxamigek.weebly.com/uploads/1/3/5/9/135976806/tosuvisef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446930/normal_5ffa66f8c0104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379482/normal_5fe97700698f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459034/normal_600b1d516b4f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_6025e74bcb75a.pdfIn PDF document text
    • https://nirereki.weebly.com/uploads/1/3/1/4/131483126/xibik-tojokukude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419628/normal_5fd1a96105fd4.pdfIn PDF document text
    • http://requiredjokblog.com/68986850808qfw3r.pdfIn PDF document text
    • https://nunosutelakib.weebly.com/uploads/1/3/1/3/131383720/tazag.pdfIn PDF document text
    • https://tusatetop.weebly.com/uploads/1/3/1/4/131408029/4b83a.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/tobito/magic_the_gathering_beginner_guide_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/ramomov.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/xesagorisajajitezupaxinol.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/zidonez.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E2 5272 bytes
SHA-256: 29af5c463a507ba641711838d3713dae334a556fbbf4fc19c5c3e69b3ec9ab66
font_01_sfnt_off0000f9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 10232 bytes
SHA-256: 08f1d13e9db63d5b5681c9f53f7fc14aff49b9455d9ff9dc9975ca7b9c225d4a

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