Malicious PDF — malware analysis report

Static analysis result for SHA-256 2310530ee2a9b8a0…

MALICIOUS

PDF

80.9 KB Created: 2021-04-25 08:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7ef7830d382f8a52ed857e36025ca893 SHA-1: 3dc7b36d7ca5d9b533fe1cfc891553187f275276 SHA-256: 2310530ee2a9b8a0cab2524835db371c307a60e3b794d9c00084a9b1cb8ca0ad
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to potentially harmful content.

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://kuzutuzo.ru/strik?utm_term=what+exercises+can+i+do+to+improve+my+writing+skills PDF link annotation
    • https://cdn.sqhk.co/sabimejuka/hc4RBgg/snapchat_can_t_login_connection_error.pdfIn PDF document text
    • https://cdn.sqhk.co/siripeka/hejgGje/venudiwevunelapubusojapel.pdfIn PDF document text
    • https://rawogozanukej.weebly.com/uploads/1/3/4/6/134623914/badev.pdfIn PDF document text
    • https://monowulesamewul.weebly.com/uploads/1/3/2/6/132682048/senozaji-jumadobif-nosulego.pdfIn PDF document text
    • https://cdn.sqhk.co/nozelenid/igVE6ij/22043959376.pdfIn PDF document text
    • http://lolafoduluj.22web.org/37743946545.pdfIn PDF document text
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/4186459.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9005981c-20a7-4b93-9dfe-a591c0bc6fcf.filesusr.com/ugd/afbba5_6c09542d4c6a4ed0b6c58cc798883f14.pdf?index=trueIn PDF document text
    • http://govilike.epizy.com/learn_arduino_programming_language.pdfIn PDF document text
    • http://jibitolokadidus.rf.gd/afrika_korps_uniform_replica.pdfIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_0a8403a35d334fb98fe4c0bb9f6dd5e9.pdf?index=trueIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_5f9838c6102c431f8bb63a884b96ad1b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d2f8159-3201-4d2f-bff2-6462870b86f7/michael_vey_series_similar_books.pdfIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_05b6e1317d2a497d8f3b4033cd34aa58.pdf?index=trueIn PDF document text
    • http://migegifixabo.rf.gd/87233421074.pdfIn PDF document text
    • http://rukevojux.rf.gd/brukner_and_khan_clinical_sports_medicine_5th_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7ccea2f-a11d-4b8c-858c-987a0498e948/jufibule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96234dc3-b433-4db1-a9d3-4ab55ed27402/nofasitozavera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3210fc32-77a7-4d50-b841-9491124776bc/feviv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cebbb8e9-e86b-4c29-b544-96a5040b42d1/rikebopinejawim.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_off0000fdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 5884 bytes
SHA-256: b1a4cfae88d2e9969ca2c159d048ff2851c1e72c58d351a8debf0e44649caa0c
font_01_sfnt_off000111f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F7 10604 bytes
SHA-256: 54a5ef30daf36738df7349651fb88b3468f869c774a0fd7bdb9e95bfc3b4b202