Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84f39367c659e72…

MALICIOUS

PDF

75.1 KB Created: 2021-02-25 03:21:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8ea66499a85e54e516fd4bcd719d0b48 SHA-1: 21c3997e0a83eda17b09c272848a9dcdfa80d9ed SHA-256: c84f39367c659e72f1831059cfcb57d6bbe5c65fd7f85960e0383c4af95d6939
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure, specifically `https://yafferge.ru/strik?utm_term=league+of+legends+update+stuck+at+95`, which is presented in the context of a fake game update lure. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=league+of+legends+update+stuck+at+95 In PDF document text
    • http://zexaribamemavi.sportsontheweb.net/84954731298.pdfIn PDF document text
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/sekizosavuvug-powowes-tezewit.pdfIn PDF document text
    • http://indital.space/how_to_get_filthy_rich_in_rising_asia_essayj7ld3.pdfIn PDF document text
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/kanogebasud.pdfIn PDF document text
    • https://fezadegijowazon.weebly.com/uploads/1/3/4/0/134096780/aeb5cddef71d979.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/8751374726nfp5e.pdfIn PDF document text
    • http://regse.website/subhash_kashyap_our_constitution_download8vmyb.pdfIn PDF document text
    • https://cdn.sqhk.co/jaziwuke/P0rwijN/72306217234.pdfIn PDF document text
    • https://xesofizagib.weebly.com/uploads/1/3/4/4/134491847/sidumosaj-bujapanu.pdfIn PDF document text
    • http://rte-ita.fun/71668880868ez3k5.pdfIn PDF document text
    • https://cdn.sqhk.co/wokowuvawuz/iiijjih/my_secret_notes_app.pdfIn PDF document text
    • https://vuziguvegevum.weebly.com/uploads/1/3/1/3/131384660/aac8a.pdfIn PDF document text
    • https://barufaworu.weebly.com/uploads/1/3/5/9/135957986/sabiguwisinev-xeregawatoru.pdfIn PDF document text
    • https://tevidozeji.weebly.com/uploads/1/3/4/8/134887032/8815215.pdfIn PDF document text
    • https://wobikuneli.weebly.com/uploads/1/3/2/7/132741052/wabeviwabugigapemub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vumamuv.myartsonline.com/zunubipu.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_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 5512 bytes
SHA-256: 499759d28217210f936cf9f284807c3d0e0b71707d8d539dee23713f50c6d945
font_01_sfnt_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 10440 bytes
SHA-256: 6f703faa54bb390a705f00270da21eb05d6d631769a7492eea7d89c2ad4f6e74

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