Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9ced6d934bc5f1…

MALICIOUS

PDF

72.1 KB Created: 2021-09-09 13:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3f7e1c4ddcb8f6d4bdeca1404d80a3af SHA-1: c44eb1546d3ffb5a3131fbc8fc3bdb8562b2c022 SHA-256: 3f9ced6d934bc5f1b7fceafef2cbc7096acfb6300c7527c476e979696498bd16
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm or phishing campaign. The presence of external URIs and the 'link farm' heuristic indicate the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8295

Heuristics 4

  • 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
  • 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://philabc.ru/uplcv?utm_term=how+to+use+find+my+phone+android PDF link annotation
    • https://sharenkon.com/files/54892902185.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/fadifak.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/ladurakabururivukegavewu.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/7051236060.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/3687107241.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/51467658671.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/nuniz.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210907090100.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/91487770514.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mirorogakexotigu.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/89494160002.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/genavaxitafaga.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/pevulegiripifelari.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/rekutejugojitizuzeva.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/46642195436.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/rusivawufujigasonaxob.pdfIn PDF document text
    • https://producto.works/userfiles/file/bitured.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613070ea83f1e---mudazasanowozevovagofeg.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/fb217b302b139366426596a436d145db/penipubuxanibil.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/pexorezamanunaxiwilomonel.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/getok.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/bowagoluxaz.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/73901047382.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/tafalifumi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 11008 bytes
SHA-256: f722597262aae2f1d680dab279aef162eba6c3c988abea4b7f1d65bbc793f857
font_01_sfnt_off0000ffcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1