Malicious PDF — malware analysis report

Static analysis result for SHA-256 3364d5d3b915543e…

MALICIOUS

PDF

76.1 KB Created: 2021-01-08 20:01:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c087c8e58f37c2e010cfe19ac02a10cb SHA-1: 1d51f6c9fafeaca18f3e1606fd1ab73f93b088ea SHA-256: 3364d5d3b915543ebf81574543457ceb2098fa9fecdbe186146f16988c650005
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-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://traffnew.ru/123?utm_term=uc+davis+clubs+and+sports PDF link annotation
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/forobodarubulipik.pdfIn PDF document text
    • https://rutemaja.weebly.com/uploads/1/3/1/4/131438840/felekorusoxiso_mojajadajeg_wizebo.pdfIn PDF document text
    • https://batarodev.weebly.com/uploads/1/3/1/3/131380453/4f15e144b2d8c.pdfIn PDF document text
    • https://wamexololizod.weebly.com/uploads/1/3/2/7/132712163/0c02aa430db90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421462/normal_5f99178849121.pdfIn PDF document text
    • https://wumetitazidizo.weebly.com/uploads/1/3/4/8/134885052/8327721.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/jjdgiji/mit_mban_application_deadline.pdfIn PDF document text
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/e26a17f56d370.pdfIn PDF document text
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/4515868.pdfIn PDF document text
    • https://cdn.sqhk.co/zegetaru/uhjdgc8/27386955808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_5f9a587868b27.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/878e9925-e5e8-4812-8897-9a8415e89964/30972262275.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/ledakasepobodozelotexik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f345cb8e-3241-4a64-ad3c-fe7089b47ff2/38062566716.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_off0000ec39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC39 5256 bytes
SHA-256: b69163f8bbee29714702ce2873525d8d48d4399be5c6884a1f13764103441885
font_01_sfnt_off0000fe26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE26 11028 bytes
SHA-256: d675c9e27e00149f40edf95c02c7ee2c54dd34c984fe7ba09d84df144806998f

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