Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7877b6c50a4771…

MALICIOUS

PDF

80.3 KB Created: 2021-09-09 18:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: effe594b1c59f06a11978ba72c6af49f SHA-1: 69986fc6131f80e7aa9613ac0919476b98d7fe40 SHA-256: 8c7877b6c50a4771dc30e5953ec5844393553f183d7a5d917eae493895bede2e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6021

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 http://kiemdinhcan.com/Images_upload/files/83484542132.pdf In PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/bukilikewokezebinupas.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/60936201437.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/fazuxokivudomedab.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/tetibedifelavevirewedej.pdfIn PDF document text
    • https://forumsevens.com/images/file/kuzes.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161312aca0ff0d---lejotaxidadubokazuramuwal.pdfIn PDF document text
    • http://laserinnsbruck.com/static/54571734095.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/vakefujuno.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133178226757---zukojepavalotojarafulor.pdfIn PDF document text
    • https://baglab.pl/galeria/file/zizurepazokatur.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/93717409563.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/51621007697.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/xemanejepulovixave.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/vafekatavawitedogaviw.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/kowenodazo.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/milapirufipudi.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/83181486527.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/53740171828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=watch+the+snyder+cutPDF link annotation
    • 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_off0000ec5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 18908 bytes
SHA-256: b6ccd364c6a85df79d79b49a9044a9e71d04e450c366f5edc84402f149c4a6f8
font_01_sfnt_off00011cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBC 10416 bytes
SHA-256: feaf13f192a2ae9f515b08c65d91f132b39c456b3acc35f949f663534c77eb44

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