Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd86ffbc3a9f95d8…

MALICIOUS

PDF

76.0 KB Created: 2021-09-12 11:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb683242962233074fbca23069317fd0 SHA-1: 97e37ad620cd48ce497ac1796ef4374c9737240e SHA-256: dd86ffbc3a9f95d8916b26291b63e8795d41aec1be46981c3298762cdaa8f0b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lure users to potentially malicious sites, likely for phishing or malware distribution. The presence of multiple unknown URLs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://mtydizayn.com/userfiles/file/93953469296.pdf
    • http://hk-bbc.com/upload/file/1603239025.pdf
    • http://wakabaeducation.com/userfiles/file/tewazapozipunimozubejeja.pdf
    • https://eagle-aviation.com/userfiles/files/11702551654.pdf
    • http://tuvanluatdanang.com/upload/ck/files/nijaganir.pdf
    • http://pc580.cn/upload_fck/file/2021-9-3/20210903231243128997.pdf
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/pujaneratuzarosazab.pdf
    • http://wami.cc/data/files/32383803480.pdf
    • https://zakarpattya-tour.com/upload/nanexuzidexusiba.pdf
    • http://ks4073.com/file_media/file_image/file/mizalitusujebafedijaruso.pdf
    • https://srldirect.com/ckfinder/userfiles/files/barogipisuxekujexa.pdf
    • http://gyarmatilovastorna.hu/userfiles/file/19750395487.pdf
    • https://vinacomvietnam.vn/uploads/news_file/20888414008.pdf
    • http://progfin.pl/userfiles/file/54558411263.pdf
    • http://maximaviajes.com/FCKfiles/file/88808053421.pdf
    • https://mai-avto.ru/upload_files/file/94522800691.pdf
    • https://muacash.com/webroot/img/files/tonipexasutije.pdf
    • http://nataliashishkina.com/userfiles/file/nagitonejudoxedukedevalu.pdf
    • http://sendedianqi.com/upload_fck/file/2021-9-9/20210909033650155297.pdf
    • http://3e3i.com/UserFiles/file///boxokomujumepebe.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133aeaec42b2---45886341060.pdf
    • https://faktxeber.ru/resimler/files/ladonutosudusasexujub.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=balagtas+zip+code
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c229.bin
a49a7111293f0d481920d5175db6b0c1aba74c8695f1214da433ec3b3c3f3256		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC229 18420 bytes
font_01_sfnt_off0000f244.bin
18ec3f2a95cd0f8e234a2deb8de2540b219b62bfa2e322b16343a2842197acc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 10596 bytes
font_02_sfnt_off00010a80.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A80 16792 bytes

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