Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63ae59a54c841d3…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 07:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7477f588660c9dc1dc536fe986f09e87 SHA-1: 0aafa5218ca87b9382cfcfe9c5e672c82925b9d2 SHA-256: e63ae59a54c841d36acbdcc061232110deb339a3c398658e1d3dc21ac1b1e9b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many using UTM parameters and pointing to disposable hosting, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, but the overall structure and URL patterns are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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://laborke.ru/uplcv?utm_term=kirito+sao+season+2 PDF link annotation
    • http://debsecond.net/UserFiles/File/fugujovuzafofikojozuxuna.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/2441192843.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/22280610798.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/61135720141.pdfIn PDF document text
    • http://pk.mo/userfiles/file/wabirunaparom.pdfIn PDF document text
    • http://15881588.com/ckupload/files/30919005572.pdfIn PDF document text
    • https://maviet.vn/upload/files/66750246080.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/75128434002.pdfIn PDF document text
    • https://blugarden.eu/file/44399014591.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/falekefizixoka.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141164618cfe---nikukojiledosomubakagek.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/63436557126.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff66669599---20718524591.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/19152601717.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/28035683910.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/70678165542.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/6871182973.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210904_4DC698FF5D72AF88.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/napozuxepezajalijafesar.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/zalozexuzemepemunaxax.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/tidetuwe.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_off0000bef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF6 18884 bytes
SHA-256: 7304d030fd8c2d27928d86f24cb9cb0f0f8bcd0fadaff9da9c779fdadebe870b
font_01_sfnt_off0000efa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 10168 bytes
SHA-256: 6cbfa516e8fa0daefd0f0e26d0965343dc221f6fe7d9e207e238b51476004319
font_02_sfnt_off00010696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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