Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3d7d775b83daf0…

MALICIOUS

PDF

77.2 KB Created: 2021-04-07 05:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b12cab504aac41b5fa31d8634c83de1d SHA-1: b46bf55ddf1d6c0bc38f069cd42c88586fb0764f SHA-256: 5c3d7d775b83daf0243f85516024b94e82b85373ae92370e903433c0fc40060e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. 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
  • 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://vilenefex.ru/strik?utm_term=que+es+un+seminario+taller PDF link annotation
    • https://pavofadibap.weebly.com/uploads/1/3/4/3/134370944/7937c7f5ecf2f.pdfIn PDF document text
    • https://rawogozanukej.weebly.com/uploads/1/3/4/6/134623914/tigisibakujanu.pdfIn PDF document text
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/losiriporonobenitij.pdfIn PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/mekupiv_raguzevem_fefibiwugut.pdfIn PDF document text
    • http://fasadi.site/rumozuliwufiwaxolosexiv49g0w.pdfIn PDF document text
    • https://fenogelojana.weebly.com/uploads/1/3/4/9/134904444/patitulajivafur.pdfIn PDF document text
    • https://cdn.sqhk.co/bowawugafux/f3gcnhj/5669392724.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/114_chakras_map.pdfIn PDF document text
    • http://nanebaxexob.getenjoyment.net/kuwotopurugebi.pdfIn PDF document text
    • https://xoboxevoz.weebly.com/uploads/1/3/2/7/132740619/08009b9c57680.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/hSgczib/2_swords_crossing_meaning.pdfIn PDF document text
    • http://chestlune.online/basit_eitsizlikler_km_sorular_ssqwq15.pdfIn PDF document text
    • https://cdn.sqhk.co/xagogowan/biehaii/80268126700.pdfIn PDF document text
    • https://keninowe.weebly.com/uploads/1/3/4/6/134617270/13ba586.pdfIn PDF document text
    • https://zolagefotatol.weebly.com/uploads/1/3/4/7/134709454/momoxi_dowibeb_wakovonukomo_fipute.pdfIn PDF document text
    • https://mituzeru.weebly.com/uploads/1/3/2/6/132681412/adec2c257839.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bilisedutave.myartsonline.com/37611765584.pdfIn PDF document text
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_a0f92b404b8d43d28b81a37b444fdc10.pdf?index=trueIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_9218cd21e3ac4f3cacb9f3a316d495eb.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE342 4776 bytes
SHA-256: 1b95b4797efdfb2a1593ec730fe0dfd6a95de1f8e2f3932881dc24e2107b426c
font_01_sfnt_off0000f353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF353 11636 bytes
SHA-256: 3e2667f175abaeeb35883a8ec700d18c7d64590c811639389606b327b98107f9
font_02_sfnt_off00011810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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