Malicious PDF — malware analysis report

Static analysis result for SHA-256 f314c16c1839c9bd…

MALICIOUS

PDF

69.8 KB Created: 2021-10-04 00:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0d90fa6afe682040da4d1251a10c2f50 SHA-1: e6556e58aec5b9bdd58c549495dedbb11e51d83f SHA-256: f314c16c1839c9bd109eca93bf7f8bd532318dd42f8e189c979d5ba7adb6b7f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many links on disposable hosting, suggesting an attempt to obscure the true malicious destination. While no scripts were explicitly extracted, the presence of external links and the overall detection profile strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=slope+protection+measures+pdf PDF link annotation
    • http://chiengthai.com/file_media/file_image/file/69605795290.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef33e34d7e---nobebofoxaxavamin.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/pagelesozupigikijunewevu.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/zenevugatujekikapigef.pdfIn PDF document text
    • http://battle.bpv.su/content/files/files/mumigokimepofumiwazur.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/52258693860.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16131907b32ef7---toladuxavevamijebowuv.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/faxumadufojotizegawedop.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/5815824178.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///77635939847.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/lariwifupunazogas.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/puvifoforewaxuvibole.pdfIn PDF document text
    • https://mfdesign.hu/files/file/39372212340.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/2217816953.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/29896791607.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/ziwobusexetuwimowosap.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/23946532863.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/kugobazos.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/72160496827.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/xedejelekikefor.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/piwemelokumeroketowesum.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/52864391605.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/lidipikoriremijotivu.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/wanolamununabixifer.pdfIn PDF document text
    • 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_off0000b37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37A 14536 bytes
SHA-256: 8be1799b7fc17609c78ffd3e4d48d6293ca13bed1777dee7a60eac3416dfbf1e
font_01_sfnt_off0000d7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EA 10956 bytes
SHA-256: daa1357b3cbbba79a11b82da2844a585a93d7883b2212b2ea2bb296826e551a8
font_02_sfnt_off0000f143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1