Malicious PDF — malware analysis report

Static analysis result for SHA-256 03cca0665ad730f9…

MALICIOUS

PDF

74.9 KB Created: 2021-09-20 12:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34b12970d327e563dab6b5426b7e9ee2 SHA-1: bea9220c3a3e6855efa100c9497e7a48bdba1745 SHA-256: 03cca0665ad730f9d43752f2cbd4f95c3e3dea98e3077c58af272aefbc959108
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded links, many pointing to unknown PDF files on disposable domains, suggests a link farm designed to distribute further malware or phishing content. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://greenhousehotel.vn/uploads/image/files/turivegopileva.pdf
    • http://homeopathyhongkong.cn/files/89153278721.pdf
    • https://tramhuonghanoi.vn/upload/files/girak.pdf
    • http://aimecostruzioni.it/userfiles/files/derop.pdf
    • http://ceresasrl.it/userfiles/files/tupemipobetipezowomep.pdf
    • http://klpa.net/userData/board/file/votulul.pdf
    • http://hflchw.com/upload/file/mirigaworubas.pdf
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4843820180.pdf
    • http://1night2day.com/ckupload/files/48742804985.pdf
    • http://miryangpension.com/FileData/ckfinder/files/20210905_93EB0ED5378E9AA2.pdf
    • http://dienlanhhuubinh.com/upload/files/dalifajuniwolaxigiwas.pdf
    • https://infoenergie-loire.org/userfiles/file/34363298418.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/827c3b4f8c6f014d4139ccb2ba745dcb/bawinupo.pdf
    • https://jakspravnenapsa.cz/userfiles/file/78544444203.pdf
    • http://nieruchomosciklodzko.pl/files/file/japut.pdf
    • http://lsbwg.com/ckfinder/userfiles/files/20210917/2327392852.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161380bccd7c77---leronidagida.pdf
    • http://autosoftware.company/autoresponders_images/files/16010661415.pdf
    • https://giant-nano.com/app/webroot/userfiles/files/siroz.pdf
    • https://karpataljaturizmus.hu/upload/10821903469.pdf
    • http://k12kos.com/ckfinder/userfiles/files/30464966811.pdf
    • http://printrun.nl/userfiles/files/16302791975.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/pazikibid.pdf
    • http://britishcytology.org.uk/ckfinder/userfiles/files/89621261097.pdf
    • http://cappellastudio.it/userfiles/files/31588206609.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gangstar+vegas+hack+version+download
    • 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_off0000c29f.bin
e4113bbb3f2c775d7a69f47b71a3922d0d9ec73a42e0611cd04e3de35d6e4729		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC29F 16452 bytes
font_01_sfnt_off0000ec7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 16792 bytes
font_02_sfnt_off00010496.bin
a641e0c2b3c39713fcf1262524258b93e07636e93110e49cda96f4ac4a65d0b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 10932 bytes

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