Malicious PDF — malware analysis report

Static analysis result for SHA-256 c750ce046dc44eff…

MALICIOUS

PDF

79.6 KB Created: 2021-09-13 12:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 210a6419ef25885ebddf7b882314b971 SHA-1: ba30e4db5c10026746bfab8e23dfef072213f050 SHA-256: c750ce046dc44eff1b1dee3c1d6febb1bc8d609e35d24a4fb60b592c3822605a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URIs, many of which are hosted on disposable domains, suggesting a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://escaletravel.com/userfiles/files/52034302191.pdf In PDF document text
    • http://drsuthichai.com/userfiles/files/duruxuduki.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/80808293210.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/19133993042.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/tuketivusevif.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/76290825102.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/85339885323.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/70136389372.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/34319747012.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/11067680759.pdfIn PDF document text
    • http://shesob.com/file/files/vurapofav.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/60848283709.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/pujapexo.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/8965597486.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/numifedotogivuxejub.pdfIn PDF document text
    • http://esistore.de/userfiles/file/14627641200.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/52076914109.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/24832086738.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/kajasusisivilanaxi.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613854eb66085---kejenekodunep.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/25967874682.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/29121619580.pdfIn PDF document text
    • http://cabini.it/userfiles/files/80300491030.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e307be5a1b---fituda.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/kijutifowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=auto+stamper+apkPDF 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_off0000cd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD88 20008 bytes
SHA-256: 122416890b0291e6001eba2dab643d8d00e96932d102d4b4cda2ff22a836b876
font_01_sfnt_off000101a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BC 10344 bytes
SHA-256: b199e6503d9432ebaa9c8b1e40fc7794869ca7dc0c73663c4f485d039bcb4553