Malicious PDF — malware analysis report

Static analysis result for SHA-256 6471492711f05c8f…

MALICIOUS

PDF

67.1 KB Created: 2020-11-20 17:12:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fe704e02455fb71bde63134d2359632d SHA-1: 29339c66e1d6a0d8cba5f4ae381cdcc716568229 SHA-256: 6471492711f05c8ff591e55352cc0fac7e6f79e53e493b765beb849f4eb4bc86
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure. The heuristic firings indicate it is a malicious redirector and a link farm designed to lead users to potentially harmful content. The ML classifier and ClamAV detection strongly support its malicious nature.

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.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=compare+2+excel+sheets+in+python In PDF document text
    • https://gefelamanak.weebly.com/uploads/1/3/4/3/134353999/86922c9766a2d49.pdfIn PDF document text
    • https://zomujowedava.weebly.com/uploads/1/3/4/6/134629266/koratevipafa-nefat-kadilinu-fedevija.pdfIn PDF document text
    • https://dewubonate.weebly.com/uploads/1/3/4/4/134466502/donivusepibubuja.pdfIn PDF document text
    • https://toxavepudu.weebly.com/uploads/1/3/4/6/134634724/zajukatilinofa_vexizinowi_rivokiriwotip_nuwona.pdfIn PDF document text
    • https://pegepefip.weebly.com/uploads/1/3/4/4/134455730/d6c378.pdfIn PDF document text
    • https://luwamagol.weebly.com/uploads/1/3/4/3/134375262/dirozitexonivubedili.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/fukorojewugikojulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418747/normal_5fa6314699db0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1df46fc6-1506-4a1b-944d-6aecdea71aa8/duzivujunam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb69f168-5db3-4fb3-a895-d9f871f60f0b/daluzoraginuwom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82010950-4a6f-4700-8816-93f270486ac0/ritemizajuwunotamimax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe2830d1-750f-41f7-b58e-b59278bb7b14/refis.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/brche_multiplizieren_und_dividieren_aufgaben.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf5893eb-bc24-486e-89fc-8fb16d39d974/exercicios_resolvidos_de_curvas_horizontais_com_transio.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/miller_xmt_350.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_off0000ca5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5F 5380 bytes
SHA-256: 9345f6765b35453b65ed62ae80d1553cf053dcf3f6cdc6638778b4c4dac57ca8
font_01_sfnt_off0000dc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC81 10324 bytes
SHA-256: 21f40b147c817373308853cf647e764a19487c9f0cab2257e1687f056c96cbe7

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