Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d136c9e6df3a38c…

MALICIOUS

PDF

88.9 KB Created: 2021-09-12 09:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 640913f7ef85c86cc9d7c4e5e8eb7bde SHA-1: 001f6cca2808eb8db2a964beca1a1f495f7347e3 SHA-256: 9d136c9e6df3a38cfd0283804091db7ad09e7345a67305d841d2980221fdf011
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and the presence of many external links align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://rosabaum.de/web/editor/files/zojobezusizip.pdf In PDF document text
    • https://austarpharma.com/upload/files/42713382387.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/supusurenu.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/79195433182.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/11740816373.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/vepute.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/lofeludolixut.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/48706484947.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136544eea409---56992096934.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/tuvesogopej.pdfIn PDF document text
    • http://creationart.hu/files/file/73995847971.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0753ce24f---jetozowawedavo.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/fidejit.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/23061242013.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/68109324409.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/xidep.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/bupenufozifafiduje.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/83818491346.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/35515354482.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/vugetutela.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/boragoderema.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/67185760609.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/naxerupozafag.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/jogilubigejinekolixefob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=movies+released+november+2016PDF 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_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 10972 bytes
SHA-256: 5dae075497670710f77d1b819819cd3560b7e736a71a247305521690c6d05eb4
font_01_sfnt_off00010dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FC 18816 bytes
SHA-256: 8882f887088755eb053b82128d8d6c060b509c9035293ddb30cd7ba95c141afc