Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe7f9671cfdfef7…

MALICIOUS

PDF

74.7 KB Created: 2021-02-11 12:06:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4f701a36820b2f5e2954d7020d8dd26d SHA-1: 7401de11ea385c7db3c522c85d885fb4560650d5 SHA-256: 5fe7f9671cfdfef7099b467dfa8e5621e093a2c37c49acce3f60d6bbadd7a26d
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to exploit user trust by presenting seemingly relevant content that leads to malicious sites.

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://jacksth.ru/123?utm_term=man+utd+vs+cska+moscow+2009 PDF link annotation
    • https://nisuwifa.weebly.com/uploads/1/3/1/4/131453943/9913676.pdfIn PDF document text
    • http://ipai.online/44041571446pmqa9.pdfIn PDF document text
    • https://tajewarupimef.weebly.com/uploads/1/3/2/6/132681391/3704975.pdfIn PDF document text
    • https://cdn.sqhk.co/resasenubori/jbidqno/jugar_snow_bros_original_online.pdfIn PDF document text
    • http://qwertyujg.xyz/mifewajalekoro1tki0.pdfIn PDF document text
    • http://tanuwoxomasosog.22web.org/topapiw.pdfIn PDF document text
    • https://sawagifavemon.weebly.com/uploads/1/3/0/7/130775832/bijosixalazoz.pdfIn PDF document text
    • http://fastgetme.online/spotify_for_artists_desktop_app93dae.pdfIn PDF document text
    • http://fruktovik.com/44879386129fwwpm.pdfIn PDF document text
    • https://jimedugevebuz.weebly.com/uploads/1/3/4/4/134437071/7649269.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/3452cb.pdfIn PDF document text
    • https://jaweditulopo.weebly.com/uploads/1/3/4/3/134313576/7955859.pdfIn PDF document text
    • http://datinge.site/monster_legends_breeding_guide_chartdcotw.pdfIn PDF document text
    • https://bumifinanefisan.weebly.com/uploads/1/3/2/8/132814282/68089af645d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fozikabev.epizy.com/c_d_performance_mansfield.pdfIn PDF document text
    • http://lubudag.epizy.com/16654926072.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/bemaj.pdfIn PDF document text
    • http://wixufoliwesomep.epizy.com/greeting_card_template_vector.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_off0000e747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 5608 bytes
SHA-256: f673bcb37ad0e6f2c390a93992d8b13fda2981e4d9f42f18381874870ee72442
font_01_sfnt_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 10204 bytes
SHA-256: 749217a68d5cef55c321e74def9fbf8b79adffc1c77a3cecafa6f70c8e5e4854

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