Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e0df2ca7a6f269…

MALICIOUS

PDF

86.2 KB Created: 2021-09-18 04:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b34e9097b8e08a02451640af15fe113 SHA-1: a7d117a2b76c7f0a945e285e2dd3cb23d3e891b0 SHA-256: b5e0df2ca7a6f269c8338e13eae26be95534ec6ad79101c54a7badc10d2cff06
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous links to other PDF files, many of which are hosted on disposable domains, suggesting a link farm or redirection scheme to facilitate the download of malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/98378764276.pdf In PDF document text
    • http://noithatsah.com/webroot/img/files/20413501405.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/15920486768.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/simawosawanajedumazase.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/daposuloko.pdfIn PDF document text
    • http://kim-clark.ru/files/file/75854558921.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/74668674052.pdfIn PDF document text
    • http://idcla.net/upload/files/52899421839.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134a61384916---81484654999.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/kuvaruwu.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/76554218886.pdfIn PDF document text
    • https://serka.com/serka/upload/files/zuserodovobop.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/90213551607.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/70603488202.pdfIn PDF document text
    • http://showpelec.com/data/file/20210905_195302_456.pdfIn PDF document text
    • https://gdaniec.com/upload/files/fodirumepofo.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/85783009918.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/18202044.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/dilibugipoko.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/risapifuvarusoba.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/taradinagogapude.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/xomawifurub.pdfIn PDF document text
    • http://preiss.at/upload_files/files/xavizonolononutinir.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/71511475545.pdfIn PDF document text
    • http://dubossari.es-pmr.com/constructor/dubossari/ckfinder/userfiles/files/99532143102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=gta+3+lite+apk+obb+downloadPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/77422444148.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_off0000eaee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEE 10648 bytes
SHA-256: 59984753290f97b3223effb56d8f844342d803dd4d3b1f95c8f3001462abc165
font_01_sfnt_off00010344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10344 18216 bytes
SHA-256: 6ad42fa66d8cbe905267ed41aced003150186af013dd2fcdd1e107455caa3093
font_02_sfnt_off000132a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1