Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3571e22d5a2891…

MALICIOUS

PDF

78.5 KB Created: 2021-02-16 01:41:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3e156bfd5e37f92a48a57584421e9e24 SHA-1: 10004081ab64748dd72c7dc651f700d5cacfb60e SHA-256: 9f3571e22d5a2891372b4251c72ea3c348fe405fcd525dc56376604129b16a6b
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=how+to+map+a+run+on+map+my+run+app In PDF document text
    • https://cdn-cms.f-static.net/uploads/4423166/normal_5fe6366b2e9a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464852/normal_5fce070c11087.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380223/normal_5fe3a4d7bc580.pdfIn PDF document text
    • http://center-about.com/bavutokoxunamitulebyi4d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_600cc3622aae2.pdfIn PDF document text
    • http://experiment.website/81241421016i9iy0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468267/normal_5ffde496525a1.pdfIn PDF document text
    • https://wemivera.weebly.com/uploads/1/3/4/3/134311686/xawetilef_giwuxo_vijovirenarabe.pdfIn PDF document text
    • http://filanion.online/the_pirate_caribbean_hunt_cheats_ipade3f3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_6010ceb05ab15.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/dejazuvorira/wakaxizamajeniwovi.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/chance_the_rapper_snl_performance_review.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/95172724617.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/vehicle_accident_report_florida.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/elimination_method_system_of_equations_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/61234213416.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_off0000f76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 4912 bytes
SHA-256: a7098b8867f9d11a8ba391dce0cd3e2f5b0dada394451bcf0f49a2cad1c3740f
font_01_sfnt_off0001081b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081B 10700 bytes
SHA-256: 22224ec12beca73110a71caac0e8699be56073ace0f24568052aef04693efdb9

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