Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b05ec478f3f370e…

MALICIOUS

PDF

77.2 KB Created: 2021-05-08 22:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ac4d971af3a66179913dac45813b7c4 SHA-1: d450945b8ecd12937268ad7bf7a09e41b02ca814 SHA-256: 8b05ec478f3f370eb25971268c706a66fc4d97e030949498d498b2ded8359d5a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML_NYX_PDF_MALICIOUS and ClamAV detections confirm its malicious nature. The embedded URLs are likely used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=chapter+2+3+lord+of+the+flies+questions+and+answers
    • http://strahauto.website/zelotelekifugatemirumirmug7t.pdf
    • https://cdn-cms.f-static.net/uploads/4457561/normal_60620ae0a2688.pdf
    • https://kamojadatuxam.weebly.com/uploads/1/3/5/3/135316538/liridefutebi_vevup.pdf
    • http://apelsins.space/mugizuwabigix37fvp.pdf
    • https://mugakosi.weebly.com/uploads/1/3/1/3/131379948/rewagepopi-nagoxejavaloko.pdf
    • http://cartest.pro/latakerigeruvuwebefejuxom9i1ji.pdf
    • http://fitit.space/56211313941vaqd9.pdf
    • https://zoparidozuxeb.weebly.com/uploads/1/3/5/3/135390671/f58d339.pdf
    • http://kinorio5.xyz/vexofuxagogujubijajawegsgwf.pdf
    • https://jujizifij.weebly.com/uploads/1/3/4/3/134309807/d73e5e844.pdf
    • https://ronafipilegov.weebly.com/uploads/1/3/2/6/132681204/gogumoz-jemoga-junasijaxu-sutafek.pdf
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/8771dab8.pdf
    • https://bidawuvebera.weebly.com/uploads/1/3/5/3/135390130/5212992.pdf
    • http://hugertely.xyz/antecedentes_judiciales_policia_nacional82p3d.pdf
    • https://static.s123-cdn-static.com/uploads/4417122/normal_60083e19bea8d.pdf
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/zevirusirikozovomavo.pdf
    • https://pokotozumunas.weebly.com/uploads/1/3/1/4/131453498/1024857.pdf
    • https://kunagotuj.weebly.com/uploads/1/3/0/7/130739098/tawifufav.pdf
    • https://fumeseteno.weebly.com/uploads/1/3/1/4/131483149/e17aae8215ed8f.pdf
    • http://mini-cam2.club/blender_eevee_texture_bakingcehfy.pdf
    • http://minuette.me/fofom99leg.pdf
    • https://buwigare.weebly.com/uploads/1/3/5/3/135308802/e519b23443.pdf
    • https://musonilemif.weebly.com/uploads/1/3/4/7/134752032/ruwojero_faxikeduguvumi_sakit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f298.bin
63b0cd4865d22b057dd638acb3748c0105e6110501aaa1a9904535a24f8f8afe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 5548 bytes
font_01_sfnt_off0001057c.bin
605158ccbef9b2abdcafef24d239543e6f60f31f2a178acaed5f541e9c4ff768		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 9772 bytes

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