Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a933e5dda98b79…

MALICIOUS

PDF

87.6 KB Created: 2021-09-13 20:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 12654a3e91963bfb92782f5f56e9a410 SHA-1: cd461ef2278927700c01ca086815337d33dfd2ee SHA-256: d1a933e5dda98b79ed7dd13761acaae112b057e7baace77279a4ecd2afbbc2e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links, potentially for SEO manipulation or to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF format can embed JavaScript, and the presence of numerous external URIs points towards an attempt to lead the user to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://woft-dining.com/webroot/editor-uploads/files/33813569694.pdf In PDF document text
    • http://olgapolyakova.de/files/files/66429009890.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/6104341703.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136778008b87---gafekaj.pdfIn PDF document text
    • http://change4best.ru/upload/file/vikut.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/41890373107.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/sigitososamuxaz.pdfIn PDF document text
    • https://combrooncom.com/contents/files/39259194289.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc194d605a---visinoxipirunes.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/54424785158.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/79194740118.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/xumazofogatap.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/34281560119.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210903052432.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/nonasadajazenepekamo.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/11471420402.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/081758337920.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/zolowamarowemuxovu.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/18756460084.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/sedege.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/29606767663.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/11310058986139865f72c14.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/7733450614.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/99314984243.pdfIn PDF document text
    • http://yanartextil.com/firma/files/joxasalikimulusiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=gameboy+color+emulatorsPDF 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_off0000f0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 10588 bytes
SHA-256: 47ae0db5743fe21fe80aa440c8a214e422e7f92f31080543f4883fcf72d71602
font_01_sfnt_off000108fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001210e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 18592 bytes
SHA-256: 2f8065b7d18cb407bd0aa733d680da00678a953219ffd57aa630145f7916fa53