Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd926b0505fc51b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 05:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 41f1a73ffdfcf9147a38d8a45298cf80 SHA-1: e583eb577f362c962c3e31c52354a8ea61a20abf SHA-256: 6dd926b0505fc51b3e69b38a3183a3e7ff40eaf5437848b3adcb6e02bc7cc715
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lead users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://melz-feu.ru/upload/zorowigekij.pdf In PDF document text
    • http://hillcrestneighborhoods.com/userimages/63619007062.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/genukot.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/mededalidisikitutav.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/goxalibexizejesibebor.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/defafi.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/radilez.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/dutamamezosiwapujiwaku.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/26851396433.pdfIn PDF document text
    • http://yuli-china.ru/d/files/36688546563.pdfIn PDF document text
    • http://letdentalab.com/img/files/68410079395.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/cae2bf9a2d5144532c22acf516b00922/karobikurawo.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/vofonu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/11ae2848702581fabecef197942fe596/mitesobetizadapudin.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/zupumipomawar.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/9976287643.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109041128338924.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/67251191653.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/motizot.pdfIn PDF document text
    • http://geose.ru/userfiles/file/xigovidunebibubujigu.pdfIn PDF document text
    • http://clingac.com/d/files/bisewalarafibu.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/45704373904.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/1187464015.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/38135965379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=simple+and+compound+interest+worksheet+answers+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_off0000dd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 11236 bytes
SHA-256: 830cc141378434047831c06f4c2ec521fa64f3bb10c646edb76980ee8f2a994d
font_01_sfnt_off0000f75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75A 17084 bytes
SHA-256: 0504ca997ba77f442e5459fba3d0eca34ba1134730a848a9ff8c4d24885167a3
font_02_sfnt_off00012393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1