Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb55cff516e13581…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 13:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f95295c8af5d4632317f210bd3bfc8d SHA-1: 1115ad2d02415ac3cb74ae812b65a2e1e1b29cec SHA-256: eb55cff516e135812d32aba0af27a29ad557c25ebb7227b10b2d49ac27ee08b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/50321079114.pdf In PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/ratokazeweve.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/suxagol.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/gawabuwaruma.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/kebikexivusuxutidefori.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/bozufekixufim.pdfIn PDF document text
    • http://www.bash.cl/media/file/nawasarali.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/92430046061.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/13983663920.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/botavebemuzapaf.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/31977481956.pdfIn PDF document text
    • https://membermimpi.com/contents/files/xenipupopi.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/71127065250.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/nofafebe.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/43027304564.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/53683207407.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314242be21d---soluwinuzujem.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/womev.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/dumobigi.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__613A95EFC89A0.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/rakapogin.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/75250231329.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/33807316995.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/biwodufedaloves.pdfIn PDF document text
    • http://186086.com/upload/files/gukup.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/dezodibi.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/81064269165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=web+series+online+watch+freePDF 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_off0000d7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EB 16740 bytes
SHA-256: 5732c27571fffa099d781b74b1960f9608aae2111b5a17bf6942d2d83e7e6b85
font_01_sfnt_off000102f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B07 10652 bytes
SHA-256: c5fea7a6e52eee5f0191bcebf69e1f2d2e6fdf544b738536feeb173d9fff994a