Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5354fc53db41f6…

MALICIOUS

PDF

89.2 KB Created: 2021-09-21 03:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9745b098ebb8ae7ceebed3c26fa97960 SHA-1: 6c86c90217b1df60e192f618071006c11d834d30 SHA-256: 8e5354fc53db41f6a493a66e2f7fbeeb29bdb4189d2449b41193bc714fdc8d24
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://chcial.ru/uplcv?utm_term=super+mario+theme+piano+sheet
    • https://joebalogh.ro/imagini_ws/40628772818.pdf
    • https://bloc-immo.com/images/57025391563.pdf
    • https://resicolor.com/upload/files/wemopixixapudarobodefapu.pdf
    • http://timnhanhonline.net/upload/files/76291401458.pdf
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/foworedigenimi.pdf
    • http://wernitznigg.at/files/5853202464.pdf
    • https://brihat-group.com/assets/userfiles/files/xanixaxofatixijetitez.pdf
    • http://wahluenfty.com/userfiles/30664815033.pdf
    • http://hani-bee.com/userfiles/files/53978696676.pdf
    • http://zonweringbelgie.be/ckfinder/userfiles/files/raxetarugup.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f9113be71---zibesi.pdf
    • http://deforma.it/userfiles/files/tuvikezifal.pdf
    • http://kuhomania.ru/ckfinder/userfiles/files/sunibususafopufuzitiw.pdf
    • http://mariekevanvlierden.nl/survey/userfiles/files/11140036698.pdf
    • https://systematix.pl/userfiles/file/fezosubox.pdf
    • http://abpjseah.news-read.com/upload/files/94281822931.pdf
    • http://uniroll.pl/user_images/file/tatuvolaginugefi.pdf
    • http://na-bytecek.cz/UserFiles/File/dobapasoteravexo.pdf
    • https://fortworthdental.net/cmsCart/upload/file/16779454303.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161304f0b2fc3f---67523112356.pdf
    • http://studiotecnicofrisoli.com/userfiles/files/37110784935.pdf
    • http://www.kowel.com/ckfinder/userfiles/files/1631014183.pdf
    • http://recko.ru/ckfinder/userfiles/files/59840635163.pdf
    • http://huyndaicaudien.com/upload/files/57488630558.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f46b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 16792 bytes
font_01_sfnt_off00010c82.bin
d201c0f82eb7f38ea7bc20ee4147ae1175b96f80685f0f70ed4d2c6b2b48203c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C82 10644 bytes
font_02_sfnt_off000124aa.bin
d10e11891cda58d8d82cdba4bd89742b8a4fd05e2e14df1895ddd96f5fcbe747		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124AA 18988 bytes

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