Malicious PDF — malware analysis report

Static analysis result for SHA-256 69c1d1a555b991fe…

MALICIOUS

PDF

87.8 KB Created: 2021-09-08 14:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d3163c8b7eadaa72fdc335bbec315fb0 SHA-1: f39e1a4ab74b78a414e422f0c3f9915bdd129be7 SHA-256: 69c1d1a555b991fea61a547640d963526ac6230d59b976de755ab520ffdbd935
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site. The numerous, often obfuscated, URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://profix.fr/ckfinder/userfiles/files/96383575671.pdf In PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/tumixarinivoregik.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/xodawozo.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/witonowekob.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c974dfc86---kurotorojujipubasebifi.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/vubute.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/gabakuzosoderovijamine.pdfIn PDF document text
    • http://topstec.com/d/files/23955818269.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/15988860235.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/87111661048.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/72048330783.pdfIn PDF document text
    • https://areicon.com/images/file/zevelido.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/44299318957.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/dumubujofor.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/29272814949.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/dejurobonetabugama.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/mifoporofutowosatakam.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/59449009161.pdfIn PDF document text
    • http://blccy.com/userfiles/files/tekijezonalixixeforuduwo.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a11950040---zevumegijusal.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/pegadixitokiwasov.pdfIn PDF document text
    • http://demkapi.com/resimler/files/58638541543.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/viwesuzajuvomujun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=resignation+letter+format+personal+reason+pdf+in+marathiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 10992 bytes
SHA-256: 9f1cc5e1513e51e9d72b42eb5798bb56e9703269964e205cd98cbf0aae9663c7
font_02_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426
font_03_sfnt_off000117c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C8 21816 bytes
SHA-256: aa9fa873a4c9e0749c750841e1aecd2553d42fd1b8e1ad353573becf32d20759