Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0700a750115a99c…

MALICIOUS

PDF

78.6 KB Created: 2021-02-28 20:50:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e13727da588d129166db90adc6f9a87f SHA-1: d3756c854474e0bb27169874e5bb74e2a172ad05 SHA-256: f0700a750115a99ce87f87d4d27d49aff17b78b3e72f5de0f314e1702c25f77f
186 Risk Score

Malware Insights

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

The PDF document was identified as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and extensive link farm are indicative of a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://kuzutuzo.ru/strik?utm_term=every+other+day+diet+blog PDF link annotation
    • https://jonaduxito.weebly.com/uploads/1/3/1/3/131384171/d45d5b3f2d2f88.pdfIn PDF document text
    • https://reratedazakowim.weebly.com/uploads/1/3/1/3/131378897/morawiraxu.pdfIn PDF document text
    • https://jupoxoguji.weebly.com/uploads/1/3/4/0/134097256/sufukalirojubob-lisotaporum-zepezarixevuf-zipefifipegojul.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/six_easy_pieces_barnes_and_noble.pdfIn PDF document text
    • http://bowemesuzot.iblogger.org/46618131153.pdfIn PDF document text
    • https://sitevipisojorop.weebly.com/uploads/1/3/4/6/134639105/dileki_jubigufe_rijabusow.pdfIn PDF document text
    • https://cdn.sqhk.co/naliwanik/abFhfXB/daxuvuzinobolovexeri.pdfIn PDF document text
    • https://wibixebaroz.weebly.com/uploads/1/3/1/8/131856543/kepoweniroju.pdfIn PDF document text
    • https://motanufogok.weebly.com/uploads/1/3/1/3/131381166/xidugal.pdfIn PDF document text
    • https://cdn.sqhk.co/niporatibu/jjcjhIp/vozokepugu.pdfIn PDF document text
    • https://kusikulovaledif.weebly.com/uploads/1/3/1/6/131606813/1476272.pdfIn PDF document text
    • https://suduvigil.weebly.com/uploads/1/3/4/6/134697429/16da8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 5168 bytes
SHA-256: 650d4fac90c295dba3be206710a7a2f868d970a01ed5232e54c0ffb37dd22f26
font_01_sfnt_off000106ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 11460 bytes
SHA-256: 3fe0f4313b1b9a957cf2e3e536668ae7ad14968f5607f76ffc2a683d2255b986

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