Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7887ba2409d6bc…

MALICIOUS

PDF

70.8 KB Created: 2021-10-10 14:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b38e000e864787417aa52bb73eebced2 SHA-1: d942ee3f5e6ef59ccae0035c281104418d978f13 SHA-256: ae7887ba2409d6bc5f525c177123ecc4ff4268b302a9b69592fa08338d962efb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm structure likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.pibmg.com.br/ckfinder/userfiles/files/files/fatavunapegesatikaz.pdf In PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-5/20210905185921611242.pdfIn PDF document text
    • https://partnermind.cz/images/files/xixanokoxejovenalima.pdfIn PDF document text
    • http://spakimthi.com/upload/files/76685389363.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/wivoraruribewelopow.pdfIn PDF document text
    • http://e-sportis.com/images/upload/tisek.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/musonax.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zadijivufalunonadofukagi.pdfIn PDF document text
    • http://aminotp.com/upload/files/lajenura.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/91167116830.pdfIn PDF document text
    • https://12tiga.com/contents/files/49510759740.pdfIn PDF document text
    • http://no1sushinroll.com/uploads/files/foketik.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1615627edc1c43---vafafibimuxusuwazosopufe.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/20732039066.pdfIn PDF document text
    • https://gtsk.solar-napkollektor.hu/js/ckfinder/userfiles/files/11388538447.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/24821447658.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/zorenifebizatobomusatuf.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/ronolesiduwu.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/zefedekudigarufod.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/fusewirakurowosokabemijim.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/nuxatagilajin.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/94928626051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=things+to+build+in+my+minecraft+survival+worldPDF 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_off0000b399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB399 11392 bytes
SHA-256: 484cd3c09d1452fa6fc575ded59fef545965a06c3645cfbfe9c122038b5a9548
font_01_sfnt_off0000ce1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1D 15664 bytes
SHA-256: 9d7bf3e620a28df829569226d4332575f0067ff7dba77e91de85774b769257a2
font_02_sfnt_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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