Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ab5c9bbb5b57dd…

MALICIOUS

PDF

69.8 KB Created: 2021-09-24 23:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc2614234e259d833d3b94958b6eb399 SHA-1: e752117aeb34d64dc611f0a9f903d7be376cb046 SHA-256: e5ab5c9bbb5b57dd22270ee8b00c7ccd96f1658e7108a0fb281bc1a19e3da2a8
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to various PDF files. The presence of a 'utm_term_redirector=True' heuristic further suggests a campaign designed to redirect users through multiple links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://kabelkyaobuv.sk/editor_uploads/files/7544291480.pdf In PDF document text
    • https://www.tunnel.de/files/uploaded/file/damadomitub.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/punas.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/38992185893.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/84179877464.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/pivegurexojejos.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/wabak.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/7958744972.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/solaforusubajuz.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/fazefumoseduzekilesoma.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/71784427623.pdfIn PDF document text
    • https://stopserv.ru/files/file/36398077464.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/44854521994.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/purira.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/voxozo.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/45345136774.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613246f082672---91533717386.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_12_04_13_07_1360.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/kewotepomugefofujiroz.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/depiworopoferukejegafubuv.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c476f4bdc0---salisinadizegafodalugo.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/63384225400.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/55024864480.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/gugitekij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pokemon+ruby+version+download+apkPDF 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_off0000af10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC727 11056 bytes
SHA-256: 66aa26139e121e54d4b8254d4277b2a319ceb2e12edceed62d1b76180aeec57e
font_02_sfnt_off0000e0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 16272 bytes
SHA-256: 49950bfe262e729f2bf159069c4a75baf5ff276ecb5756d2a215893505e66fe0