Malicious PDF — malware analysis report

Static analysis result for SHA-256 519ef96f9532f837…

MALICIOUS

PDF

92.3 KB Created: 2021-09-16 04:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a400123a49d900d100d4adee71bfa2b SHA-1: ccf3f49b5450e90d81287beaf1b7c83e2f63ffb4 SHA-256: 519ef96f9532f8377d5a741e22c4f6302f948ed5923bf3c9ee80951d80c3a28f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to potentially disposable domains, suggests a link farm or phishing attempt. ClamAV detection and ML classification strongly indicate malicious intent, likely to download a second-stage payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://capitaloffice.pl/fotki/file/98008246614.pdf In PDF document text
    • http://apsara.ru/userfiles/file/84001688335.pdfIn PDF document text
    • http://woykoff.hu/upload/file/jotorolumunerevovovugopu.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/vizowega.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/33708038108.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/zetoxewonupizadanuf.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff12bd6f35---53204714007.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/2986841267.pdfIn PDF document text
    • https://timminsrenovations.ca/file/7k9AlcJorlzet0O0.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210910_7905A63985AD8D82.pdfIn PDF document text
    • https://frisch.ro/files/file/34391234108.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/gedowelig.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/sevoribudekavofo.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/tolusumujorolo.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/mufajerikiwuvipamudo.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/vikedofumiruweberomuw.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/mewaguke.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/86550769400.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/67792778152.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/39869082063.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/lodugofoxoworanugulud.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/74583578419.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/a4ea6c325f8812a0950d4bf963c7ccdf/75743616662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=999+games+in+1+apkPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 16192 bytes
SHA-256: 126aabc53b187bc4421529373f04e2f66a11804dfeaeb35cb650b132d56c1dbd
font_01_sfnt_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
font_02_sfnt_off0000f8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 10444 bytes
SHA-256: d80791cb86940df28f2b83f7d788df7b816da3e497e2b891b65d702c5d945ef3
font_03_sfnt_off00011096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11096 24028 bytes
SHA-256: 79d1e20151c566b25a49b7939adfb1450cb75020bba676eff854ed1105034c65
font_04_sfnt_off00014dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1