Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9bd216a76fde47…

MALICIOUS

PDF

85.0 KB Created: 2021-09-20 06:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2a4fbae34b4eab76ee4394f21984c255 SHA-1: 4a1f47299edb656c9a20de37fb1931305efe0d5f SHA-256: aa9bd216a76fde47059b20a0a0ede3a9a13bb72b1f40af579999afcf08a659b1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to disposable domains or link farms, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://cloudinfo01.smartevolve.com/images/ckeditor/files/lotitifari.pdf In PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/36782242730.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/25446116562.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/58841445461.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/makiwaxufiso.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/zidunuzador.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/kefute.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d01b1b28db---9175080451.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/wusugopate.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/82020709743.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/32847838366.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210915155641843.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/wirabinuxibe.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/xenomep.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161377cf690fd7---padudiwexelusuxenosuviled.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/39283928810.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/6883113405.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/70410554241.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/jutaxuxugetiv.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/64842886472.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/bizevijo.pdfIn PDF document text
    • https://penal-garazh.ru/files/36090519387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=freud%27s+case+studies+pdfPDF 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_off0000e7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A1 18124 bytes
SHA-256: 8d71ffb3246e476bcb08ecba395fa85bbe7689e81c6d3d0a6ad2a04e20086623
font_01_sfnt_off00011698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11698 10452 bytes
SHA-256: 33cdc98ce2aa94c6acd460bbe635878821a7d662e41d72b8ebea1296fb94db39
font_02_sfnt_off00012e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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