Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18cdab20058f68b…

MALICIOUS

PDF

61.4 KB Created: 2020-11-24 05:36:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bd65e570dd94c9b4b269f8b03f508139 SHA-1: 184852d4d7494d68a6ce1064408ff0c7ea278420 SHA-256: b18cdab20058f68b8d210e20fbc9b999080c9f17f30c27e566fe760a3a71782c
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external resources, masquerading as a "sheet music" document, with one critical link pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cctraff.ru/aws?utm_term=jurassic+world+fallen+kingdom+sheet+music In PDF document text
    • https://nuzixusimupe.weebly.com/uploads/1/3/4/3/134306281/nogogipokudi-nedinoma-zegugujaba.pdfIn PDF document text
    • https://wutawodasigupo.weebly.com/uploads/1/3/4/5/134512212/gokos-robupudowujom-gojovizafanu.pdfIn PDF document text
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/kesavemed-podexesabij-dufixogefagaje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484990/normal_5faab0ec28584.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/patotale/arme_anna.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/ateten_gmlek_zet.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/55247437902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5889679a-f394-4951-896f-70ee503377a0/lobivaxe.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/grace_hill_fair_housing_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/memorial_junior_high_school_address.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/5e_monster_manual_flip.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/titotobazubilulijizinuna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21f97f5a-dd33-40ae-a5a0-26fdea139a74/c5h10_ez_isomers.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_off0000b226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB226 5580 bytes
SHA-256: 37f1eb4db60ae5fc5097d1561bd672ee0f011aa5b266a09b7776a75fa2f6b07c
font_01_sfnt_off0000c50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50A 10608 bytes
SHA-256: fd03f4c16033559c94cb5483da10cb2ca721f5d31704add0d78c1cbf8e602812

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