Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d79691a59e644d…

MALICIOUS

PDF

67.0 KB Created: 2020-11-22 15:59:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3dabba04189d39b80e87563549199d00 SHA-1: 9c619614421a6927315825b4d2ae787d6e6db23f SHA-256: b6d79691a59e644db77c0df46f4558309effc0c7dea6468468fbb26284eb9980
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://traffset.ru/aws?utm_term=word+label+template+avery+l7162 PDF link annotation
    • https://debekekuwafa.weebly.com/uploads/1/3/4/4/134473288/4075095.pdfIn PDF document text
    • https://sevivuninuk.weebly.com/uploads/1/3/4/4/134459749/pinurali.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f871e313545b.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/3639528.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/jivarovosutivi_dajamefake_zubisivemuduji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373240/normal_5f9757b1c8a6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f8a50af8df65.pdfIn PDF document text
    • https://pezitojuxesuvog.weebly.com/uploads/1/3/4/6/134608136/xasikav-zufowunidepad-sazabolotutet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414494/normal_5fb8c45566640.pdfIn PDF document text
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/joxojefet.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/purixifusipelid/87805759195.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/kugavuruvatavawufotosaj.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A7 5660 bytes
SHA-256: a454b80957829ab7042a310f7615a99833aced755ea0d53a645dcb24aca3651f
font_01_sfnt_off0000c3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F1 10960 bytes
SHA-256: 94c7c7d1e019e7a516127139c5bca235b8abee91fcccf66263f7ed3407a145ae
font_02_sfnt_off0000e989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 16176 bytes
SHA-256: fa55fc4edf6bd0eb45c3a683aeea8d24a875f9eafc243b4b391aa2be5047134d

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