Malicious PDF — malware analysis report

Static analysis result for SHA-256 93983c37c5cb4c72…

MALICIOUS

PDF

64.3 KB Created: 2021-03-30 12:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 252026aabeaa1a1dd342794680e08509 SHA-1: 28dc8d290458a62e6f81769d81235d80a7748a1d SHA-256: 93983c37c5cb4c724355c1b8b3fa7be8b5b3fbcd37a91edd5da44e8e2b74cdcc
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The presence of URLs like 'https://jumiwimov.ru/strik?utm_term=janiya+heart+touching+love+story+new+hindi+song+2018' indicates a potential lure to phishing or malware download sites. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious 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/strik?utm_term=janiya+heart+touching+love+story+new+hindi+song+2018 PDF link annotation
    • https://fumuradowije.weebly.com/uploads/1/3/0/7/130739974/4167624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413374/normal_6019984094491.pdfIn PDF document text
    • https://cdn.sqhk.co/xomatujod/M6OLfgj/87070666010.pdfIn PDF document text
    • https://cdn.sqhk.co/pumapajewa/dnhhRZt/31585314172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420602/normal_601f132e7fc45.pdfIn PDF document text
    • https://wimupajano.weebly.com/uploads/1/3/4/6/134682998/5381486.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/hjbggha/rapid_city_warrants_division.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505326/normal_5fc8f8b0bffb3.pdfIn PDF document text
    • https://femerofuvarilef.weebly.com/uploads/1/3/4/0/134012326/3829363.pdfIn PDF document text
    • https://zonapabudaxaj.weebly.com/uploads/1/3/4/0/134017389/8802f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421780/normal_602f25179e826.pdfIn PDF document text
    • https://gugagefa.weebly.com/uploads/1/3/4/3/134343265/8513843.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/njju49P/zetukosurepiginoxon.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/d2fda63e-d3ba-4eed-bb06-33062110a445/tricky_questions_in_java_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3de7b3e-e39f-49a8-825b-4e4c2c71e358/fuluwis.pdfIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_bdc816f91a67435884acec53c5f006f3.pdf?index=trueIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_6466ab2630da429190f721605d847af3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/33bcedd2-1c34-450a-bb59-a2b47cd444b4/1983941202.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_off0000bf48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF48 5964 bytes
SHA-256: 122d6132b346419b4988793cf54add0f50d4bc1065dbc3e1c618ed18cdec2f1b
font_01_sfnt_off0000d3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AB 9432 bytes
SHA-256: e9fa1a0dc98e4e188f6beb53f6e4e3b102ff355343d7c7bf22cda07cf7f9b03a

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