Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fb558e5297014f…

MALICIOUS

PDF

80.4 KB Created: 2021-05-04 17:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f411221710fe61f17f10a6075cd6659e SHA-1: d14975af6654ca1f106a5f4b700f228b2b31d7cf SHA-256: 87fb558e5297014fb5adfd56591d4c4d7cdb218ee1bffac3887ff24b83da6f33
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or redirection to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/strik?utm_term=administraci%25C3%25B3n+de+medicamentos+en+pediatr%25C3%25ADa+enfermer%25C3%25ADa+pdf
    • https://cdn.sqhk.co/lewiwifo/fjegcs8/top_100_billboard_june_2018_free.pdf
    • https://cdn-cms.f-static.net/uploads/4419828/normal_602612bd2e66b.pdf
    • https://wofugegiperezaj.weebly.com/uploads/1/3/4/5/134528457/410415.pdf
    • https://cdn-cms.f-static.net/uploads/4390330/normal_60133235135af.pdf
    • https://cdn.sqhk.co/taxodisilif/hvhcrer/center_for_disease_control_vaccination_information.pdf
    • https://cdn-cms.f-static.net/uploads/4405903/normal_604183d7625f9.pdf
    • https://cdn-cms.f-static.net/uploads/4388421/normal_601739b81e746.pdf
    • https://ganalazukomej.weebly.com/uploads/1/3/4/7/134714395/vupixelola.pdf
    • https://static.s123-cdn-static.com/uploads/4446650/normal_5fccd450ea5a2.pdf
    • https://cdn-cms.f-static.net/uploads/4402949/normal_60301d3168aa9.pdf
    • https://cdn-cms.f-static.net/uploads/4481408/normal_60393876eaeb8.pdf
    • https://cdn-cms.f-static.net/uploads/4407576/normal_601b184002197.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5a09f858-0958-42be-ab20-6436d956c30f/jazidarer.pdf
    • https://uploads.strikinglycdn.com/files/005f0332-45ea-42ab-9ac0-dacb8f759806/90260448067.pdf
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_9c9da3c890d24688ae2ba81b0e2a169d.pdf?index=true
    • https://7e574f8b-ef34-4833-8dee-b18f3ac9fc91.filesusr.com/ugd/af8ffd_a2a48f114d974c50a864b20c5cf0fa7b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2333319b-89f9-42b9-ae0c-954c91df7cd9/bash_scripting_tutorial.pdf
    • https://21dbc830-6d60-48ad-8ab0-00d2b3cb69e0.filesusr.com/ugd/18d949_165cb78848594df28b91269e18bbce43.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f772.bin
3ec20379d42edb452a46fd96161d3e172293da40a434e53f7166fb7d47cdcc3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 5448 bytes
font_01_sfnt_off000109a1.bin
d09d5090da3ce5c7beecb248399e4ace7b4f599128112f51f8ab098dac2fecb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109A1 12252 bytes

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