Malicious PDF — malware analysis report

Static analysis result for SHA-256 07655920350534dd…

MALICIOUS

PDF

83.0 KB Created: 2021-06-04 01:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8272fe0333e155b3fd5af6976d336460 SHA-1: 05dd9b4aa23e0cbaf434ad276f509c8401f9c66e SHA-256: 07655920350534dd87336f3daf45e15ec31142b646b6327b23f1ee4f9bf06e56
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO scam. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, potentially leveraging embedded JavaScript for redirection or further exploitation.

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://pelibifir.ru/123?utm_term=html5+semantic+tags+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426571/normal_5fe15966216b1.pdfIn PDF document text
    • https://mozalotajevel.weebly.com/uploads/1/3/2/6/132682758/manakideba_guzomejavi_varigeve.pdfIn PDF document text
    • https://fasosizive.weebly.com/uploads/1/3/4/3/134351581/vinunuzo_jatofigu_takojavegisek.pdfIn PDF document text
    • https://wivixilor.weebly.com/uploads/1/3/4/3/134371520/febujadu_gofubamatumexos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421360/normal_603c360462efe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479223/normal_605f5539aafa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5fd740d0a0035.pdfIn PDF document text
    • https://lonerunit.weebly.com/uploads/1/3/4/0/134017922/1181021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413243/normal_606a170704033.pdfIn PDF document text
    • https://ragajepegoxi.weebly.com/uploads/1/3/1/3/131379061/6318930.pdfIn PDF document text
    • https://faxipanonuk.weebly.com/uploads/1/3/4/3/134352952/kobogojinigologijesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489057/normal_605c6b5293dbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490369/normal_604b12092f98c.pdfIn PDF document text
    • https://mesopivupezuna.weebly.com/uploads/1/3/5/3/135311967/gujapolefeliv_radazul_dibezofugogifog_vemanodojojigez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sonopewobu.pbworks.com/f/grille_salaire_secrtaire_mdicale_2020_fonction_publique_hospitalire.pdfIn PDF document text
    • http://vosebim.pbworks.com/w/file/fetch/144580044/understanding_your_college_experience_strategies_for_success_2nd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b2f0d03-f7a3-4555-932c-eddbd48701df/holiday_themed_family_feud_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dae90d34-aaff-46c7-ab0e-e347eac575c6/98771659412.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_off00010462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10462 5464 bytes
SHA-256: c42552adcb2418e9efc8b0cd240730625a3d5eb37c82c412f53d485f9db4d17f
font_01_sfnt_off000116ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 12160 bytes
SHA-256: b7e82f6eb02cfc822e5ee32b2812b8f7c4ae046d28f03497e724f77e45d13fa6

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