Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4192f6b59b90a4…

MALICIOUS

PDF

87.2 KB Created: 2021-09-13 23:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 899dba2fb855d3d9c3f573edc094ef5a SHA-1: 4cc2ad5541a3a8e4d666f9ebf40e1088749ca0ff SHA-256: fd4192f6b59b90a46458dbdd36605e34f1d47a06e08e5905591786b368c87353
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://elskenecologie.nl/files/18493815661.pdf In PDF document text
    • http://deurenhanger.nl/userfiles/file/gaxafabibeja.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/17651195332.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/mujifusoxinak.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613b249e0199f---99117901446.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/rolos.pdfIn PDF document text
    • http://ijfbn.com/editor_up/35954799133.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109131109078665.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/37369781061.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/pikitita.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/40225976363.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/43540589216.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/43008902578.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/31891405151.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/didaso.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1d59ee2bf---44768846749.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/fojaniga.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecfa72ca5d---3002059926.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/98518196206.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/gonuxelikomakiwudodovubor.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/vutumagepinufoxak.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/38599113465.pdfIn PDF document text
    • http://yjccnc.com/upload/files/fakufadan.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/81625100462.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/dofurupurabukene.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/32170838281.pdfIn PDF document text
    • http://test-immo.com/file/69406020076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fundamentals+of+fluid+mechanics+8th+edition+solutionsPDF 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_off0000e7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10008 20212 bytes
SHA-256: 9ca6206e6459f110931f3233ba88d5b9888ba3fad25805bc362a6ebe7c35b77f
font_02_sfnt_off00013548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13548 10928 bytes
SHA-256: ab0d4c26107b091f692568cbdddc03f5dcc4c7b6bcee944ce2731ed0f61e92b2