Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5324e622b397d4…

MALICIOUS

PDF

80.4 KB Created: 2021-09-25 11:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e049fe7ec770aacf68573e166c58b028 SHA-1: 1f3a8da61f7452fca1cd0b9092f98bfe5eb4d375 SHA-256: 0b5324e622b397d4b193c65fbe89cf57d9897e3952cae1ebc3a1044b26bdc85a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to an IP address hosting a PDF file, which is a common tactic for phishing or malware delivery. No scripts were extracted, but the presence of external URIs and the ML detection suggest exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://iieng.org/editor/ckfinder/userfiles/files/xuzajofezetikedaz.pdf In PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/19010243323.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/kepanozapajurugexujemi.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/berexibesarivokelofinoti.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/12243628494.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/46033149406.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/58962871355.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/52989977096.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/a3a5645ee9c546e815a1532f564b6d30/69877662442.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/muxedixunigabit.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109120404126680.pdfIn PDF document text
    • http://sbcnepal.com/images/file/91200580079.pdfIn PDF document text
    • http://calisnt.com/uploads/files/68943188144.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/62488813329.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a00a45c4b---69408870063.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/besumirazine.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/2105193024.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/42225111496.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210916_9855561469F8BCDA.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/94358194748.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/27141819441.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/jujifezovelifanavavul.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/12496696226.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/11466022262.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16139ec240806d---fixemirimizinu.pdfPDF link annotation
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=watch+rupaul%27s+drag+race+season+13+onlinePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC996 11144 bytes
SHA-256: bbcb54ac56edecd00f40f88db5c693051113b5286517fa4b37ffb3316ea86314
font_01_sfnt_off0000e380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE380 21500 bytes
SHA-256: 0fdee309cfe01f37f9fb8914b4522a8278811451c729f1baa294296dd11f8ada
font_02_sfnt_off00011b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1