Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e66ff9af3d1065…

MALICIOUS

PDF

125.4 KB Created: 2021-09-21 04:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f4b32fb4b1dead15efaf286c4f1c4cf7 SHA-1: 88e60de1e38ff72659ceb265f71c76af27c00d85 SHA-256: c0e66ff9af3d10656478f640928fae8eba98c2b33f147038265cd989ed1f3b5b
222 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document employs social engineering tactics, specifically a 'Browser extension / update installation lure' and a 'ClickFix' attack, to deceive users into performing actions that could lead to malware execution or credential theft. Embedded JavaScript streams and numerous external URIs, many pointing to potentially malicious domains, further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soyaksiesta3.com/userfiles/file/kitis.pdf In PDF document text
    • https://farmacieitaliane.com/documenti/file/gupiropimin.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/68944890411.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/52492054486.pdfIn PDF document text
    • http://uhorder.com/upload/files/dofapusegelunerad.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/nofakuj.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/govamasepix.pdfIn PDF document text
    • http://mcutech.net/files/79064616375.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/56933824439.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/vexuluximupif.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/nometizogofijenidifuza.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/59081263944.pdfIn PDF document text
    • http://adice-area.com/pictures/files/80819997195.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210918194701468.pdfIn PDF document text
    • http://retailcop.ca/files/33889781179.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/pojuzafad.pdfIn PDF document text
    • http://chipgene.com/image/files/20210903_195655.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/dubalokosinoxurewib.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/40284012753.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/jijiziwugiwif.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/76674679655.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/vamur.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/42113856398.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/zifutagikizu.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/24759584496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=photo+cheat+sheet+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_off000185cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DE1 19136 bytes
SHA-256: 696273dd10c54377b1c7ed7ff034622cfbdcbfe612f1f459d55acaace838cd7e
font_02_sfnt_off0001cfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFDA 10376 bytes
SHA-256: 8a8569e954c48dcf1719276267c7b9610851cfb359ac6a74e02648a680f914b1

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