Malicious PDF — malware analysis report

Static analysis result for SHA-256 a569a2d7b3fed57f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 04:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d0e625aeee11582256572271104f9c42 SHA-1: c09d8b50712365ec0a79cd1e0b64e0660c23170d SHA-256: a569a2d7b3fed57f03cfff560f5ebed3b4a044ffa8f61024d303c7528d887508
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kalendarz.probik.pl/fckeditor/userfiles/file/75696973596.pdf In PDF document text
    • https://sentinels.ro/userfiles/file/34990191139.pdfIn PDF document text
    • http://rayanchem.com/d/files/37224229104.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/tojakozofori.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/84080490248.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/25359523562.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/53265560417.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/36101654936.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/nogexi.pdfIn PDF document text
    • http://krupongs.com/images/file/41498247810.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/21020677953.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/gejumelenosenewo.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/bojosofewipiresavejediz.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/89713746125.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/zunuwedesijanagivejo.pdfIn PDF document text
    • http://allasclub.com/campannas/file/78968646090.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/27589883544.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/busikuwesaselenifofevox.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613021da9b7af---70556382088.pdfIn PDF document text
    • https://slide-bearing.com/d/files/lumedexanajelezatidewak.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/12099270859.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/86690916084.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2c8bbeb951eae169cbb72a851e97fd5d/lepejaxapelunebalozumif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=machine+learning+for+beginners+pdfPDF link annotation
    • 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_off0000e054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE054 17632 bytes
SHA-256: 73764e7b9b6ac1e1b9c6f229759c4ee2ab1070d01128835811af546e992908b1
font_01_sfnt_off00010dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EF 10936 bytes
SHA-256: c07a7b9448f76fd2d56325088e24f021915258e6a0810f27be0e09951c98e57c

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