Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a9a4db929e6e48…

MALICIOUS

PDF

80.4 KB Created: 2021-03-17 16:39:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ce2060fab06889ad9eb8dccda6ab299e SHA-1: 67d95adf4c2a5a778ae303e9510b1354f4956fbb SHA-256: 33a9a4db929e6e483a472452a95c1c8351381c5d0377966051a0332a5d87cfb1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, one of which is `https://jumiwimov.ru/123?utm_term=bu+jhansi+llb+exam+form+2019`. The document body, though heavily obfuscated, suggests a lure related to an exam form, aligning with phishing or SEO spam tactics. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://jumiwimov.ru/123?utm_term=bu+jhansi+llb+exam+form+2019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485156/normal_5ff346ee8a2d6.pdfIn PDF document text
    • https://kanevuto.weebly.com/uploads/1/3/4/4/134484588/94700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499942/normal_6034e2072dc00.pdfIn PDF document text
    • http://vuwiwetidajin.mywebcommunity.org/stampante_canon_mp240_errore_p8.pdfIn PDF document text
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/wiwogefavub-durikozomiboni.pdfIn PDF document text
    • https://fiwobezamarevev.weebly.com/uploads/1/3/2/7/132740324/3370e316535d345.pdfIn PDF document text
    • http://duxinivodozular.mywebcommunity.org/juxoxer.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/c2f48951-5007-45df-a50c-46c953ffc19d/95597651147.pdfIn PDF document text
    • https://0d801636-e20c-47cf-9654-f2c4f0d28fb9.filesusr.com/ugd/2e7c9c_4c14d3369db745e691d9c185c6b9dba4.pdf?index=trueIn PDF document text
    • http://xojutavuvexiso.rf.gd/40600167167.pdfIn PDF document text
    • http://galikamot.epizy.com/blackberry_keyboard_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2358a96-dbd6-4eb2-82ba-d3a94b57cc9d/quadratic_equations_solving_by_factoring_worksheet.pdfIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_f41bbb48340748838b99285f7a9766c6.pdf?index=trueIn PDF document text
    • http://lazazowoj.epizy.com/resapek.pdfIn PDF document text
    • http://gefilodeza.myartsonline.com/fafekud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb75544-c5f5-4f3c-89b5-bcb38b64a3c2/62400414107.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE2 2912 bytes
SHA-256: c0a68f52fd200a9d7487f4ee106c85458c96703759f93a8f7811862e44f5525b
font_01_sfnt_off0000fa47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA47 5824 bytes
SHA-256: 90ce6231a6b73f63e649199bd6cd9059f2bb40537b213bdba91a70b5ee31b5df
font_02_sfnt_off00010df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF9 11236 bytes
SHA-256: bc885b34c3825d9b43d5a0e50ac052514ecccdb81d8c7c6deffed9e1c60e2a7f

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