Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9636811af2eb20c…

MALICIOUS

PDF

77.7 KB Created: 2021-09-19 02:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ffc4028b4062c944aed10caeb23def26 SHA-1: 30d1c8898fb21165507e6ddb3b49cb52e2b6a404 SHA-256: f9636811af2eb20c6c8fc8dc14333094df3f05c6a4aaa1255cff911f66a6cf7c
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting and are algorithmically generated. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this document is designed as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious URLs, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pixomot.ru/uplcv?utm_term=popcorn+apk+download PDF link annotation
    • http://stellar.ru/ckfinder/userfiles/files/98353715346.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143e308b1ef7---xivusigobixosatavat.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/sekuru.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/vubajixiziba.pdfIn PDF document text
    • http://akademibt.com/resimler/files/76368278466.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/43996797298.pdfIn PDF document text
    • https://olterus.com/contents/files/50469664697.pdfIn PDF document text
    • http://masonhn.com/d/files/kafokefuxodubotujuf.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/wefumowupobunotapifelu.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/galixelebojaneronetam.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/jhfgf9afom95i4lbbbnre5mrn0/linezavaz.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/dowoxudetasutopi.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/33567751813.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/botixevedajutet.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/ponuziji.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/30033057470.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/34557224751.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/74411471150.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210910_104303.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/zabirepanut.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/86491420446.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/94982944589.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109111425473387.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/garupuparod.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/japijolol.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/41206323596.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/narevoteganiv.pdfIn PDF document text
    • 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_off0000cacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACC 18228 bytes
SHA-256: e14d6b9af2962366a69a69bc24a7c315b654beabfae47e3f2bf05a229ca78bc6
font_01_sfnt_off0000fa0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11223 10196 bytes
SHA-256: dc245266e3b43319421201aa8e3cc8740d7dba6b5f776c0d5905aa02be8c884a

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