Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0575ce9ebb21ecd…

MALICIOUS

PDF

76.7 KB Created: 2021-09-18 22:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1bb512f7e94b068d52114a65df18b9fd SHA-1: 7fbb50dd5fa0048da505ff18b613f667e32add93 SHA-256: e0575ce9ebb21ecd87c505a7939a9ac96d1e6e2246ab86b1f31b05b56581f909
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also features multiple links to external URLs, including one identified as an algorithmically-generated URL, suggesting an attempt to download a second-stage payload or redirect the user to a phishing site. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://philabc.ru/uplcv?utm_term=voices+in+the+park+book+pdf PDF link annotation
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/bepupadexunav.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/36212617319.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-1/20210901182416113297.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/90416356297.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133142d61347---87824581612.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/36184646716.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/59680220127.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/tofadi.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613284eea4cc5---61353365406.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/20822136728.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/surozuvutufufezurewukid.pdfIn PDF document text
    • http://canadianrockies.info/files/file/34823526728.pdfIn PDF document text
    • http://etkenkalip.com/files/mijeton.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/80507648177.pdfIn PDF document text
    • https://oasis-travel.ro/files/gitiwaxila.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210904124914_w2xfub.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/22862354222.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/18332511890.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/21049302545.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/77458052941.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/76821729182.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/50066163658.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/novoxuzamufejozo.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/filirowil.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_off0000c585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD97 18268 bytes
SHA-256: 9ade0e248c3f56e2fc95445db311de9bce410446e5109c45739bfd4e5f0157db
font_02_sfnt_off00010c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C82 10872 bytes
SHA-256: ebaeb1b467f581baecd80206ba4202422515ecbc5bab5b5070f786af4cc4c1d2