Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b36807e07350986…

MALICIOUS

PDF

73.4 KB Created: 2021-10-02 14:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7d0a5fb0accca5af395a92c32da89582 SHA-1: 017e44396c020ae577eca6e60987ed72bb227543 SHA-256: 6b36807e073509868877b4834f246c54ab939d174a59884e23a9417e715f1b2e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it's intended to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.ksmt.edu.np/assets/ckfinder/userfiles/files/31582222192.pdf In PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/rigekuwuvabirukafopix.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109050105231852.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/40847691667.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/24063359656.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/sebinizi.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/27593010905.pdfIn PDF document text
    • https://balticseaheritage.com/res/wysiwyg/file/xigibefaxozazogotadavexeg.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/23391520058.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/muvinoz.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/41890614043.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/97331103759.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/bonizekupukozaxetefolemis.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/29832269928.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb8642c20c---felizepagapufogojinuwode.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/fagamumomunugikobapekis.pdfIn PDF document text
    • http://horvathortho.hu/tmp/31381505211.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/71579316323.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/dotunasunopipozumur.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139edf2254d8---rekadupij.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/pusuguxafi.pdfIn PDF document text
    • http://haki.tincorner.com/uploads/files/suxez.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/43656645535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=zumdahl+chemistry+8th+edition+solutions+manual+pdfPDF 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_off0000b386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB386 11268 bytes
SHA-256: 5dd8da5b0f0831fd403378828c0753cae56a30c13c88b180b2f436653f644a7e
font_01_sfnt_off0000cdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E7 18596 bytes
SHA-256: 8be4fd8e5febee698a1597ce3625202963bb9acc9e1603dbea0b70399a83ecb1