Malicious PDF — malware analysis report

Static analysis result for SHA-256 9239f535803dcdbe…

MALICIOUS

PDF

67.1 KB Created: 2020-11-25 00:21:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 927cdd53e852124433ff66cf2be69358 SHA-1: eb894032ddfc9fd3bd73695a74a0158c06e20769 SHA-256: 9239f535803dcdbea9522649dfdb3b6a67d22331227e7fe91154a3adcb8970f4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://traffnew.ru/aws?utm_term=october+2019+calendar+template+excel PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472221/normal_5faec94781c9c.pdfIn PDF document text
    • https://fenivubad.weebly.com/uploads/1/3/4/4/134482284/fb981a5ad3bb47.pdfIn PDF document text
    • https://folukufisika.weebly.com/uploads/1/3/1/3/131384255/7656075.pdfIn PDF document text
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/961935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372371/normal_5f99c9b759ad7.pdfIn PDF document text
    • https://fadusoga.weebly.com/uploads/1/3/0/7/130739873/8580329.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/c70777eb-f8f5-4047-848e-f78675d289f2/togutagewoxupesaxas.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/gibirugirug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5580349d-8444-498c-99b7-3d71b5dde2d7/waxexujiginenosanal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca3da71-9e3e-4f42-9f96-995044779d96/atc_guide_mode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ad1c29a-4aca-4429-9778-2a199e0a4d6c/zuwusubajudasovokigenid.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/perks_of_being_a_wallflower.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/kolagojogo.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_off0000c962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC962 5756 bytes
SHA-256: f3168c68901ee3be56845ad0aa1b81fe2e6454113a12f44d00187d44e2842177
font_01_sfnt_off0000dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDA 10068 bytes
SHA-256: a8fc504c4e20587368ee89e5c92b6f6606d0a5bf1319cd6634bbaa698432622f

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