Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d1cf49fe5c6834…

MALICIOUS

PDF

76.1 KB Created: 2021-06-02 23:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 730ea57563cbfae4b4aa230cc5fb9831 SHA-1: 82d42b5025dbe8a4d6e43821dac09ab2dec7eb8c SHA-256: d8d1cf49fe5c6834f8b4e868c919bf53c49ce448424c54fb9218fc306bda3266
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware delivery mechanism, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://garglob.ru/pbw?utm_term=honda+2000+generator+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493578/normal_5fe7212071556.pdfIn PDF document text
    • https://xulopoxaxuwuzoj.weebly.com/uploads/1/3/4/5/134509354/5376745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449629/normal_60671ecb0367e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421038/normal_6043fc491ba9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388272/normal_5febaa8b87d99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481841/normal_60016ca5c33d9.pdfIn PDF document text
    • https://mapadubedebo.weebly.com/uploads/1/3/6/0/136095435/lizexitux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454694/normal_602334d49d0bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454436/normal_6037386e7b3f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_5fea2de8e2213.pdfIn PDF document text
    • https://nazugawexavidi.weebly.com/uploads/1/3/4/6/134678572/7258977.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4450340/normal_60b2138e1ec35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365998/normal_5fe0b382d74f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_606778a084e07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425768/normal_5fd95bf3018c9.pdfIn PDF document text
    • https://tojisoma.weebly.com/uploads/1/3/5/3/135330836/papuju.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4376099/normal_60b5dc8db0a5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425926/normal_5fc9f6dd1a471.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144412542/lusaboxodawitima.pdfIn PDF document text
    • http://pigedigasexu.pbworks.com/w/file/fetch/144515628/31807221096.pdfIn PDF document text
    • http://xibosini.pbworks.com/w/file/fetch/144497118/bolufomo.pdfIn PDF document text
    • http://fevawigo.pbworks.com/w/file/fetch/144420627/pitch_perfect_2_full_movie_free_download_for_mobile.pdfIn PDF document text
    • http://zajozote.pbworks.com/f/lokab.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_off0000edd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 5204 bytes
SHA-256: 2cd0459bae3fdce99a56979bca74ad72f3a1fc988c7fce0365b1cfc0d0d1ebca
font_01_sfnt_off0000ff6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6D 10212 bytes
SHA-256: 214db2934df5f2d4e8fe335e3c3a467409b542f8481a1af137a9a7f06905b650