Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91ca0ee998bd7f1…

MALICIOUS

PDF

87.2 KB Created: 2021-03-25 09:05:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abb481c18cbfda3a791e9aa397db0e6c SHA-1: daba510ae133d297e0a25b5d70c2a099405c3d30 SHA-256: c91ca0ee998bd7f1b12d4f4363b9aa5a13979e9104c34b1852360bd6f8fc51aa
96 Risk Score

Malware Insights

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

The PDF file contains a lure related to 'Circle theorems exam questions and answers' and embeds a URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/123?utm_term=circle+theorems+exam+questions+and+answers
    • http://lirinevewafa.mypressonline.com/fatosefufesezosuli.pdf
    • http://zesenadozefut.sportsontheweb.net/bavawiwuvulejipejezugit.pdf
    • http://gadetebes.sportsontheweb.net/lofodokasuraso.pdf
    • http://suvolupijiro.mygamesonline.org/pemow.pdf
    • http://fazojum.66ghz.com/jubutigujuwa.pdf
    • https://static.s123-cdn-static.com/uploads/4492275/normal_5ff48a871fd59.pdf
    • https://static.s123-cdn-static.com/uploads/4492259/normal_5ffff33a90cac.pdf
    • http://zegererevez.medianewsonline.com/lujupekogodukolalewoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fasomusogapovi/pets_worksheets_preschool.pdf
    • https://s3.amazonaws.com/mefonevimimix/54075785227.pdf
    • http://jirabasojexosud.atwebpages.com/direito_penal_cesar_bitencourt_parte_geral.pdf
    • https://s3.amazonaws.com/voropa/sarag.pdf
    • https://s3.amazonaws.com/fipijife/34272636960.pdf
    • https://s3.amazonaws.com/jexijer/37400521273.pdf
    • https://s3.amazonaws.com/mokamoba/62203333021.pdf
    • http://legabukev.epizy.com/56529035993.pdf
    • https://s3.amazonaws.com/zijivevip/fadijuperamom.pdf
    • https://s3.amazonaws.com/vokeri/66201507523.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011373.bin
d2dc2ce539da23aec34e36fbedb89886f07abc1e202f699fdfc6cd3eb4b9e204		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11373 5372 bytes
font_01_sfnt_off00012593.bin
cd343aed8929d60d1537ea71e45d2ad2446d6852507ae1015968820732e53146		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12593 12284 bytes

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