Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0972d168595f4b…

MALICIOUS

PDF

81.2 KB Created: 2021-02-20 11:52:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: eb0e231042b12b9650af818fdf37f220 SHA-1: e2c6dc481b42376c19d0094d1cc06ce6869b0359 SHA-256: dc0972d168595f4b76a8fd23667a7ecfe941d9159ab6f4712777248d312807af
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://leonvi.ru/strik?utm_term=regulatory+japanese+road+signs', is likely part of this scheme. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=regulatory+japanese+road+signs PDF link annotation
    • https://lokulubebu.weebly.com/uploads/1/3/1/8/131856352/4537768.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408323/normal_5fff5fabc109e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475212/normal_602d808f5a98e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376103/normal_5ff077ae57ba4.pdfIn PDF document text
    • https://xivunububan.weebly.com/uploads/1/3/0/9/130969166/fotonoxiwavimafi.pdfIn PDF document text
    • http://winelorasagi.22web.org/tomanupujidowavo.pdfIn PDF document text
    • https://jitedamanun.weebly.com/uploads/1/3/4/6/134627504/vimopazim-laxaveb-fekiro-kabulamot.pdfIn PDF document text
    • https://rifidikebipe.weebly.com/uploads/1/3/0/9/130969129/531f4608946a3.pdfIn PDF document text
    • https://lepoboniw.weebly.com/uploads/1/3/0/9/130969744/7332729.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fupuzujovo.epizy.com/kinige.pdfIn PDF document text
    • http://fufabufitilaf.epizy.com/89702165248.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_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 5312 bytes
SHA-256: d2a05ef78fb29b1b4f8639ebbc83cc3b480505b33031ed100c3ae7d202578927
font_01_sfnt_off0001122e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122E 11112 bytes
SHA-256: 7a7a4ddb55150415650b2ef3220abca59cb2f457bc4892f8714de5ecf35aa969

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