Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4963d1278d3272c…

MALICIOUS

PDF

76.2 KB Created: 2021-04-24 01:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4f54ecfb814125c0905ef3f38f60a23a SHA-1: b889a606bc46f6b2fe13b0563722c1eabf259435 SHA-256: e4963d1278d3272cab1ec234214bc4462daaa95215cc4fc0d2741f11c32a578f
186 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 hosted on disposable domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jottigo.ru/strik?utm_term=is+there+gonna+be+a+3rd+season+of+one+punch+man PDF link annotation
    • https://zajevikafe.weebly.com/uploads/1/3/5/2/135297545/8364379.pdfIn PDF document text
    • http://dadevizevarek.scienceontheweb.net/22459289014.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxapivasif/CigXgda/tetitar.pdfIn PDF document text
    • https://wivutabunoku.weebly.com/uploads/1/3/6/0/136020101/05872.pdfIn PDF document text
    • https://cdn.sqhk.co/tedalome/PnihihT/lego_elves_dragon_sanctuary_instructions.pdfIn PDF document text
    • http://xomunuxeju.sportsontheweb.net/nosineliloterexurenatafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490949/normal_602f51f6a6f71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483586/normal_602f16c9b648c.pdfIn PDF document text
    • https://cdn.sqhk.co/geruvijiwiw/DrIgeX8/70438593344.pdfIn PDF document text
    • https://jaxoruxevag.weebly.com/uploads/1/3/1/6/131606876/monesizow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464532/normal_5ff8b407cd731.pdfIn PDF document text
    • https://cdn.sqhk.co/demarumiju/wwaghaa/9954099632.pdfIn PDF document text
    • https://cdn.sqhk.co/kitatoze/VQEq1je/jizobulukipige.pdfIn PDF document text
    • https://nozirurabi.weebly.com/uploads/1/3/0/7/130738896/femuderanodub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_f032e2d1acc547aeb25d7eabacb88b01.pdf?index=trueIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_384288b1a2444ce990693fab2f0a786d.pdf?index=trueIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_3dddbe6fec124c71af76731ff4831bd3.pdf?index=trueIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_20687b94a1a449b28066d07658e410f5.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_off0000eb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB49 5780 bytes
SHA-256: c588c9a1a691670764e8409d99543b3589cbfaeae004c701b623f4490e35fca9
font_01_sfnt_off0000feca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECA 10812 bytes
SHA-256: 74d26108c3c2d3257e0df8a4e09c4df129f40ee87cd3a586b1eed6b369da86a8

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