Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d31a1fcde999a6…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 01:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 66012d7e9ba5ae7c273be3d5eb73b8d6 SHA-1: 86052fe5cd4b47eac72bcbcc5eb4dc77b296de1d SHA-256: 45d31a1fcde999a6b0ffab8e03edf3779bcb49cca0234bb86f30cb1ea8b4db1d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm structure on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.nstoplana.rs/ckfinder/userfiles/files/77154287476.pdf In PDF document text
    • http://fruitsad.pl/images/file/depekovekebipi.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/83624643456.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/mugimafujovurategole.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/94673274723.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/34534421138.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/solapobat.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/tuditodozefogu.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/60050374973.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/pixibodufiwasobomogekutav.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/lufodub.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/39141411750.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/83296415706.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/27915753751.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/vosumawulawowogireturabe.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/hlf4klfku3ogb3slqtjqp4a9ot/lelibokipirikozobuk.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161374de4b1477---fonokujovivexador.pdfIn PDF document text
    • http://fgosvo.ru/files/files/bajitajije.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/45442826828.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/40081504237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=filmywap+xfilmywap+punjabiPDF 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_off0000db16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 18744 bytes
SHA-256: 1c094cf4b76ad8686c0a65351cd15000a1211e596f028fb02328f42261892690
font_02_sfnt_off0001242b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242B 10552 bytes
SHA-256: fdbf3a1bb11012fd1db161a3ad7b8beee9409b030ecf91dc2a9e33f1fb15566b

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