Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b488a6fed94849…

MALICIOUS

PDF

84.8 KB Created: 2021-09-09 13:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0e92d3b05d3ade4cf7422b19b6a039ef SHA-1: ec65de44387d0ab6f5c3fc6dba23d08d962727b7 SHA-256: c7b488a6fed9484955b418ea1e32c96522c1cf4248ff44be15a77c727228f9c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://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://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_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
font_02_sfnt_off000117de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DE 17620 bytes
SHA-256: f3f0d6dd9a366707fb50a4cb9c15b1fa90945bae095aa3ca3ad3a5ae6d9ee22b