Malicious PDF — malware analysis report

Static analysis result for SHA-256 117501e73a636573…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 01:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6083e9e5e13390a8c4735dca392cdc23 SHA-1: ab0d64e9f48d0f3cf5f800b59b21e9e07196a9ee SHA-256: 117501e73a636573872941b65f129aa371ec4a250441bd35d99f5cbaab3a3e7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute links across many domains, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://thesciencenetwork.org/uploads/files/35557510989.pdf In PDF document text
    • https://nasco-ye.com/uploads/file/zolepanewivedajifi.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/pikitawakufudovek.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/43285501051.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/dekirofu.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/44136980228.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/susujabo.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/sigurapitilat.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/73284585385.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/fumumovoribinopopezu.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210907200053.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/wadumojav.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/bifinixiwoxikisuminisevo.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/xagoluxepix.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/gegivenelerizesevexef.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/58597163181.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/97291924749.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/dumibuzotafuduvukejo.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/saredamuwojuzodi.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161390e1dc5195---kavagevubusubexavoka.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/nikasov.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/tozebonigogo.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/dejezokesixerulawotawasap.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/xebekusuwibopufiwim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=samsung+android+drivers+free+downloadPDF 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_off0000d5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B2 10928 bytes
SHA-256: e3c17433bf8e55aee78aeef412ca44202d64d6e17d76461e39c35e155a88e0c7
font_01_sfnt_off0000eec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 17996 bytes
SHA-256: 1dfd9b99c58ccf7c88104d2aa8f6cb1aee4546be9649ccb18cec4d4d0b73e727
font_02_sfnt_off00011c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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