Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f25506a9d6f959…

MALICIOUS

PDF

64.0 KB Created: 2020-12-20 05:45:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 81026285c20675e961771e4959b0b95e SHA-1: 05e65de962ad83a1cdfbe8fce1b6c697dfbebc2a SHA-256: 21f25506a9d6f959076b4837792aa33701bdecd642524b22a74d53eb6f07fe6d
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan, and an ML classifier indicating maliciousness. The file contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting a phishing or malware distribution attempt. The presence of external URIs and the overall structure strongly indicate an attempt to redirect users to malicious content.

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 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://trafffi.ru/strik?utm_term=diagrama+de+casos+de+uso+uml PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459323/normal_5fa70eaebc71b.pdfIn PDF document text
    • https://fulafokowezoje.weebly.com/uploads/1/3/4/3/134384829/3ace5e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401691/normal_5fa646d5932c3.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/jesosiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417426/normal_5fdd1a4cd440a.pdfIn PDF document text
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/4086435.pdfIn PDF document text
    • https://piborubaladedos.weebly.com/uploads/1/3/4/7/134764427/367a91f5bcb.pdfIn PDF document text
    • https://bazulerijodinib.weebly.com/uploads/1/3/1/8/131856415/8041.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/donarepemi/32029107307.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ed4f1452f90b7fe57e24/t/5fc62334f81c9a2a0c75057d/1606820660143/college_football_championship_2019_predictions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cdd9050-062d-4b74-a5ff-42df6188000d/47070364769.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_off0000bd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD37 5260 bytes
SHA-256: 91015c3a20e35ebb22808a42cfa22bd58782af5e0812b37d1de993a302754e71
font_01_sfnt_off0000cf00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF00 11648 bytes
SHA-256: 183ed81b2892a007cbcd9215cf322dccd21c2f364c6ac3619bb80721312d972c

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