Malicious PDF — malware analysis report

Static analysis result for SHA-256 008138bbe8b5f822…

MALICIOUS

PDF

95.3 KB Created: 2021-09-13 04:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e3d6345be64fd2639798f8c4b8bba5c SHA-1: 611c13bd60663633c00813db09971f57e5fdea6a SHA-256: 008138bbe8b5f822f0e341729cd86f1e94d2d007d04a2e186f68ca50974a16de
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating embedded JavaScript and a social engineering attack (ClickFix). The document body, though heavily obfuscated, likely contains instructions to trick the user into executing a command, potentially leading to the download and execution of a second-stage payload from one of the numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://sonarkella.com/userfiles/file/wowituf.pdf In PDF document text
    • http://salman-is.com/userfiles/file/betevowibulasolom.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161306d95c7d5b---37798298848.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/53510667720.pdfIn PDF document text
    • https://aayams.com/userfiles/file/68859269146.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/bebigexoki.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/58219594992.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/kelutasefozasiguzupab.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210907_201627_148.pdfIn PDF document text
    • http://coolscape.info/images/files/japegaruvavej.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109011725325813.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/73808509487.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/73731026942.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/nogedefowadak.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/romufedewafapida.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/94390241343.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/76664936893.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/27665079822.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/zisepida.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/tinakobuzesuxelaramib.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/padavoxilewok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=headset+mic+not+working+androidPDF 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_off00010fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCF 10836 bytes
SHA-256: fb59fae6bcac6e5230ecd76cbaf5e85d1e286277b17d6dcea737d295f99fb8c9
font_01_sfnt_off0001289d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AF 18284 bytes
SHA-256: 3050fbb4813e12cc6644d2382b1ece7a1cb14591c334c27dda837f566b6af201

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