Malicious PDF — malware analysis report

Static analysis result for SHA-256 9254de9af4d58e06…

MALICIOUS

PDF

71.7 KB Created: 2021-02-22 20:47:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cf5c8f47c166dd6dfd91f4064860748b SHA-1: 5cb5e2be460dd800b5fc644afeca67767af9d381 SHA-256: 9254de9af4d58e0641eb2af7ed7f354306f37115cb35bc15f157d71aba80ef57
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document body, though partially corrupted, contains a URL that appears to be a lure for a search query, directing users to a suspicious domain. This suggests a phishing or scam campaign designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wb?keyword=como%20hacer%20helado%20de%20vainilla PDF link annotation
    • https://vadanuburizupi.weebly.com/uploads/1/3/4/9/134901301/bekif.pdfIn PDF document text
    • https://cdn.sqhk.co/luwibajik/GNwhjjf/55925939730.pdfIn PDF document text
    • http://tujokatoxeg.22web.org/10345876380.pdfIn PDF document text
    • http://tikukef.22web.org/vikizoxemujivod.pdfIn PDF document text
    • https://borerejo.weebly.com/uploads/1/3/4/0/134040615/suwom-nutiduba-wulupixirubazef-ripetober.pdfIn PDF document text
    • http://zomewegi.iblogger.org/68994802841.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/gulapore/36141436239.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/jefulogedovanom.pdfIn PDF document text
    • http://nabajorugum.rf.gd/notas_para_piano_de_canciones_faciles.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/cerebral_av_malformation_symptoms.pdfIn PDF document text
    • http://pejonoma.epizy.com/lindsey_stirling_elements_violin_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/68868991773.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/59845366396.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_off0000d95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95C 4964 bytes
SHA-256: 0478c4f114aa40907c4feb160e435668806c666c85d75291d2b4f53d8d09f277
font_01_sfnt_off0000ea0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 12004 bytes
SHA-256: a1224e3b13309b198fec47a427cad4d562003bfecbbf6156441dedcba4717db9

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