Malicious PDF — malware analysis report

Static analysis result for SHA-256 23aa2ab46ead1008…

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 16:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7cda3c8615c18231a82b0b072978c460 SHA-1: 759b3cb93ddc5357a61a1032e4373c6d3f0e81ba SHA-256: 23aa2ab46ead1008e51189822b80a4755f96e7cbe5f0d8b1c95b93e264fdd487
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to facilitate initial access via spearphishing, leading users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=widget+weather+android PDF link annotation
    • http://lollanaclinic.com/image/upload/File/fapex.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/domulepit.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/fitowasewadi.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/dejan.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/suluzugarodero.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131cae1b3f14---89384081346.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/44305554940.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/resakemigubanovubegasena.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/60599794450.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/84872761991.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/duxixawoludapamugo.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/rogifirerunede.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/raketunafarufivujipid.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/vefunadoxaxulosodit.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/4593575402.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/riwidevowotapidodeb.pdfIn PDF document text
    • http://safarang.com/basefile/files/kaxodemoxe.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/73963016980.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/monazurofovifizupituxuza.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc13f4ef1b---48753148522.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/41610109511.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/68140484368.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC27 17564 bytes
SHA-256: 932621f096a00a872a19f3e517658f14276a852ca3d09d636052ee6a5d054706
font_01_sfnt_off00010a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001221d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221D 10392 bytes
SHA-256: 0e347b9b563971e9cee19b09e8f3484e42cdb20ff011ec95b58ddc59c9015e61

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