Malicious PDF — malware analysis report

Static analysis result for SHA-256 581fcb9412240ea3…

MALICIOUS

PDF

82.9 KB Created: 2021-09-21 06:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee96c8e1e71ea5ccdd089a5ee3cc1b93 SHA-1: e9f98292acc39cd97fc4014d174c4d54ea9b2f23 SHA-256: 581fcb9412240ea39a02a8a03853972d147d3b692325ea0762ab8c95789d2513
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and the presence of multiple external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gardens-spa.com/user_pict/file/novisesisikizugaji.pdf In PDF document text
    • https://lufty.cz/UserFiles/files/nikoxirovolifebodo.pdfIn PDF document text
    • https://signika.pl/Upload/file/vavuvawelidaligikepoxul.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161355c2c569fe---40760490799.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/sixizoduvizo.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/48617109973.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/mamixodovuwolofimisatake.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/92569263911.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/75426017962.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/ledunujot.pdfIn PDF document text
    • https://nepalfinepashmina.com/userfiles/file/79619005117.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/6c08f827a3d2d81fc6dddd32125e7761/kebuvefojopepajemopet.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/posezakipana.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/tomalikapenonafu.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1631132442.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/5083938528.pdfIn PDF document text
    • http://signauction.net/userfiles/file/71891286831.pdfIn PDF document text
    • http://santeh.md/img/files/kuvomob.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/disitipodifamisixizemuvig.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/divedesusatakim.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/67007196676.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/sajenalasesazis.pdfIn PDF document text
    • http://e-district.org/userfiles/file/95582370827.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/51491185418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=play+store+downloadable+game+downloadPDF 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_off0000dc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC14 10840 bytes
SHA-256: 99fa65edd0e928e5017f57d9290d247ee9e640fbb7a16e8982c5685ca74073c3
font_01_sfnt_off0000f50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1D 18468 bytes
SHA-256: 3204ef1bb0764592b952fb2095d489c10a275ef856af7b59dd3157b29d9686c2

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