Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8e8fee93d5dfce…

MALICIOUS

PDF

79.8 KB Created: 2021-09-12 03:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5700b7ad4487f8c60d6157ba09c9c93e SHA-1: 11ee4cba68314c752b6b715a8ed5395e6e56833d SHA-256: 3e8e8fee93d5dfcef2b15b2a8afab626f75359097d3e8509414632f477303abd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, identified as a link farm by heuristics. ClamAV and ML classifiers strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://associazionemusicaviva.it/uploads/file/zaxekuduweb.pdf In PDF document text
    • https://12tiga.com/contents/files/37558951502.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/47482345323.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/fudobuxusedekisozekexufu.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b92bd1d880---sabugabudegirogus.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/zexiwuwibo.pdfIn PDF document text
    • http://wdnederland.nl/file/62048954677.pdfIn PDF document text
    • http://bresky.cz/res/file/nanegoponopajefewuzufez.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/18106588532.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/nowarasuxuginavelisax.pdfIn PDF document text
    • http://spbi.cz/res/file/kigoweruvidefep.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/vepidivek.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/12398543533.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/napijaguwotuzevegofo.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/xavalepavevumarolomizib.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/161357d007654f---9259260808.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/22975218499.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/9758680832.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/xogusejid.pdfIn PDF document text
    • http://asqcert.net/files/files/jagefiriwubatorutoban.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/32890057974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=power+rangers+legacy+wars+apk+modPDF 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_off0000d103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 10960 bytes
SHA-256: 7aa307e09e10d7ce94e9e33be1e4f445d9b1e936a2270b000c2f7ca64f893c30
font_02_sfnt_off00010265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 18228 bytes
SHA-256: d9595499665f2d3c988e5eae58eb6b373b55d6952b413e25ac28ee7e755832ff

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