Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2a0ef28bc4f8dd…

MALICIOUS

PDF

74.6 KB Created: 2021-09-22 11:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7078c773003ce6bc04e7a45f2c65307a SHA-1: ca6a280077e467382810d13782299c4e7eceacdd SHA-256: cd2a0ef28bc4f8dd0d6bff041111b95245bb4e3f8afdc423308caa8b79f1fa22
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and Trojan activity. It contains numerous embedded URIs pointing to external websites, many of which are hosted on disposable domains or IP addresses, suggesting a link farm or phishing campaign. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and heuristics point to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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://smidgel.ru/uplcv?utm_term=vidmate+apk+download+lagu+dan+video
    • http://naturalwonders.com/uploads/files/15982687858.pdf
    • http://hungthanhauto.com/luutru/files/44509480817.pdf
    • https://anandamsanyal.com/userfiles/file/46734878763.pdf
    • http://women-for-marriage.com/ckfinder/userfiles/files/pisabexopusijapafo.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161401bfa6131d---nokibemowelugogovaladenip.pdf
    • http://hydrem.ru/images/file/92936149592.pdf
    • http://ghinelliarchitettura.it/userfiles/files/rodowewulavixurasorivu.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4f33bf00487dfc8542e88c2cbf2761c9/mikunidumapakixajise.pdf
    • http://soyaksiesta3.com/userfiles/file/vosapumitivuvuvazo.pdf
    • http://cherriestattoo.com/ckfinder/userfiles/files/92958353078.pdf
    • http://studioarchperissinotto.eu/userfiles/files/wokuwexoxugixozu.pdf
    • https://rotitelor.com/contents/files/76452782172.pdf
    • https://nocnepal.org.np/ckfinder/userfiles/files/luparesutede.pdf
    • http://xn--nellieskche-0hb.de/userfiles/file/5232482105.pdf
    • http://kiajihlava.cz/UserFiles/File/67977589135.pdf
    • http://novastal.pl/userfiles/file/96920208952.pdf
    • https://penzionradvanice.cz/res/file/40842354051.pdf
    • http://studiocalderini.it/userfiles/files/zozitufatidajosupu.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469f9ecfcef---21036831247.pdf
    • http://classtool.info/upload/files/dokikijizosujapafuziveni.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/rupukixuv.pdf
    • http://ltpbetel.ro/userfiles/file/4154570644.pdf
    • http://lapempi.nl/ckfinder/userfiles/files/xamege.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_off0000bff5.bin
b739ce9b573170a3fa5b9306781a47de1b3cdc012ffc43b3b2641f2b868c5808		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF5 10780 bytes
font_01_sfnt_off0000d893.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD893 16792 bytes
font_02_sfnt_off0000f0a5.bin
f082ee6fbe1ace76b45626fd856a0b747b354488ec371d34555e27281d23318b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 17056 bytes

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