Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d7be14651f1e94…

MALICIOUS

PDF

82.0 KB Created: 2021-03-01 07:08:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e7b23258dcc83be2df0738890757ec27 SHA-1: 7c01e6b29f7e1ef213d8106f48b181b57967b2d7 SHA-256: f0d7be14651f1e948dd3409bd99a99cb5583b3c7106b6c44697ea6d128f8992f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or spam distribution mechanism, likely leveraging embedded JavaScript for redirection.

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://resalured.ru/strik?utm_term=how+to+smoke+a+brisket+in+electric+smoker PDF link annotation
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/6232847.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/community_service_needed_for_delta_sigma_theta.pdfIn PDF document text
    • https://rovibabewovel.weebly.com/uploads/1/3/4/8/134884015/492675.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/buzokibusatewujoku.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/3a3dd73504e4b.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/13027105356.pdfIn PDF document text
    • https://vijuvunido.weebly.com/uploads/1/3/0/7/130740607/047c1aa138910.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/faleguvaxutefuriboxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389127/normal_5fc761414e6ed.pdfIn PDF document text
    • http://blacklaser.ru/1029037488jxajm.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/zatazewoz/88396923384.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/cch_copy_sheet_trong_excel_2010.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_off000104a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 5200 bytes
SHA-256: 10898c32ebeaee141145dff5ed68f6581e5abfc37994a1795182f5e992fb7617
font_01_sfnt_off0001164a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164A 10936 bytes
SHA-256: 792c0be1404aaeb05b34971e4da82e299c7cd17ccad70477fd7400ade942e587

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