Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd23e432dc178b2…

MALICIOUS

PDF

82.8 KB Created: 2021-09-11 05:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8237c05cb612139b581fae2b2064491f SHA-1: eeac57d62b3e3702c1b91eeb46e506245e73f427 SHA-256: afd23e432dc178b22adc9bf0140141694a75b6f9210c29b21bd832bc541c0689
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • 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://dongkoo.com/uploads/editor/files/15678099064.pdf In PDF document text
    • http://tuecpa.com/file_media/file_image/file/dogigorujepif.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/17784210352.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/dagumibu.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fedogigegotizax.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/lapimav.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/bazodavujapidafim.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/37338024852.pdfIn PDF document text
    • http://bociany.sk/media/file/54636857701.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/losofigokixepaj.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/7931152533.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/53321383212.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/vakojesadika.pdfIn PDF document text
    • http://lagrupacio.cat/file/talojaxafasapize.pdfIn PDF document text
    • https://olterus.org/contents/files/2413883090.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b7b1cf41---woforurezofuwesarubur.pdfIn PDF document text
    • https://allianztc.ro/files/file/65490252588.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/tibimarejitigok.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/18350778861.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/xiseruzefakumile.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109060937052032.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/jorisowoga.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/xerunowowosasosojulorixo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2aa2ca97c---xaduja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+set+up+a+three+way+call+on+androidPDF 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_off0000de67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE67 17588 bytes
SHA-256: 527d98145cfe6038b8d89a86281288d302fc784baf894ed39035f0d6397fb0af
font_01_sfnt_off00010c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4D 10900 bytes
SHA-256: 85aa0824e00ad07873efff08e8fe52b44d186c86f7a20c4760f9be0b32f01e51
font_02_sfnt_off00012588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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