Malicious PDF — malware analysis report

Static analysis result for SHA-256 da39d15247ee87f5…

MALICIOUS

PDF

92.1 KB Created: 2020-11-29 18:30:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 52caabe624ce608cc904cb620ff8c99a SHA-1: decc05b9772b66fe5fa0b8c81b94431be77ade1d SHA-256: da39d15247ee87f542e70be69699f7570ee367c14e4ff51cfab78b9e14eea5c3
214 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 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 0.9997

Heuristics 5

  • 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.
  • 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://traffmen.ru/123?utm_term=2pac+you+gotta+keep+your+head+up+lyrics In PDF document text
    • https://wadezirukabag.weebly.com/uploads/1/3/4/6/134668274/1ee2e38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473044/normal_5fb0302b32bfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407994/normal_5fc2548812d9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394073/normal_5fb545df276fc.pdfIn PDF document text
    • https://lepebixetuvenal.weebly.com/uploads/1/3/4/6/134634058/zatadero.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/sibabo_vuzom_wapupibeniw_lupusita.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402507/normal_5fb5138fe0cf3.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/xilasisefi/defesilaf.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/nejifezujadopiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/windows_7_ultimate_iso_32-bit.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/65114819878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3f31525-cca2-49c8-b81a-5712440789cb/99915883578.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_off000109f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F6 5536 bytes
SHA-256: ae5b85d274175f98f1f4bf9b6d97bb9c577a38df0a0f6e2963e729338347ba6d
font_01_sfnt_off00011cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD0 15880 bytes
SHA-256: c88ae7b6be30d59035ec2abe5285354ed6dbc1237114797c07062091d00a6331
font_02_sfnt_off00014e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E30 16060 bytes
SHA-256: eb67323a3edc51f073cf7ae7c668a4400309481d93a41d1ca3bfc03d889966df

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