Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4baec474b11b23…

MALICIOUS

PDF

80.2 KB Created: 2021-03-01 18:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a4869d04c65f0154dfd15a8ac56da5e1 SHA-1: b052c488ae6d14e9a1fcf41d1493ce4b31661ddf SHA-256: ca4baec474b11b23780651c2b371f8c1a1b30bb8c35dd5166ab38b36439a01fd
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs, including one that appears to be a lure related to 'Azure WordPress hosting cost', suggesting a phishing or scam campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to malicious sites.

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://midufefew.ru/123?utm_term=azure+wordpress+hosting+cost PDF link annotation
    • http://vuzetasavuxoso.mygamesonline.org/milubalikezugeparimaw.pdfIn PDF document text
    • https://denasigetul.weebly.com/uploads/1/3/4/3/134332190/xusakilulagado.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481406/normal_5ffa217fd23f6.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/6475344129.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406482/normal_5fce857f6a199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452374/normal_6026da9148a2b.pdfIn PDF document text
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/600131.pdfIn PDF document text
    • https://nijusalelazi.weebly.com/uploads/1/3/4/8/134875584/2cdddc8637f41a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447880/normal_601d21dc769dd.pdfIn PDF document text
    • https://dorigobumin.weebly.com/uploads/1/3/1/3/131384291/wibutubavifogozi.pdfIn PDF document text
    • https://mibuvenatevuwo.weebly.com/uploads/1/3/4/6/134607329/7422010.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fataragoreb.myartsonline.com/90741528197.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/los_cuatro_acuerdos_sabiduria_tolteca.pdfIn PDF document text
    • http://lixugafepujijoj.onlinewebshop.net/18035932315.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/79323311220.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_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 5224 bytes
SHA-256: a91bb8acdf5467f15cfac637789d056cc12fa93e2a44ecac008cf312a669e8bd
font_01_sfnt_off00010f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F43 10828 bytes
SHA-256: d180259930df9baafbd155de7678438c1cc6f77def47c013040d8e6a3cdaf458

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