Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86782c0a338f368…

MALICIOUS

PDF

101.7 KB Created: 2021-09-12 09:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c013eb1fcd0a337bcf39b12a27331580 SHA-1: 19d54f0e9bd2dff3584b16f1c838c3d4dd5dff56 SHA-256: c86782c0a338f36840d9874eba15487d66cf99e09bc4a11f92b701be968d306b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to potentially disposable domains, and includes a 'download' lure. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URIs suggest a phishing attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://2013.letnifestiwal.pl/ckfinder/userfiles/files/76855607423.pdf In PDF document text
    • http://studio-castiglioni.com/userfiles/files/82826935947.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/xirujenujod.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/11599428339.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/fenudizageti.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/jeparu.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/32373779991.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/72868109688.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/pulutumodizufojo.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/kuriwe.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/48142182016.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/vixowuvavonokopegejepada.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/xotewapegaranipowe.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/14178513320.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/1153139640.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/fukerenukor.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210910062032.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/divuvobasumoxoximip.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/59013507465.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613976db831ec---23080339936.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/90862630616.pdfIn PDF document text
    • http://hak-al.com/resimler/files/73595421989.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/moweg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=river+raid+atari+2600+download+for+pcPDF 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_off00012617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12617 18760 bytes
SHA-256: 04411331c844fd16adab5ca28f5dd7b8267d1be6388361a9f962b15c4d1d8725
font_01_sfnt_off000156d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EEE 11052 bytes
SHA-256: db83d3fe02e97d9317bddb4c70ea1fe9cf3ce4407cf76704ef3d67953166805f