Malicious PDF — malware analysis report

Static analysis result for SHA-256 b876660e1bee71d6…

MALICIOUS

PDF

84.2 KB Created: 2021-09-12 21:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 46908c5ae6323df550e028cd0c4083f3 SHA-1: 7f8154456518d5e4d1e091e85dca1188fbd31e72 SHA-256: b876660e1bee71d6e880ffc212d507d8bafdd39f6f6af95f07e7d53e38105cd3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are used in a link farm configuration. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://oniceh.ru/uplcv?utm_term=gta+v+ifruit+android PDF link annotation
    • https://nurdagihaber.com/resimler/files/nosed.pdfIn PDF document text
    • http://otczenacts.com/media/files/80666344223.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/b3cmjcdfr0pgh3p0h49p4g7ik5/pemufowif.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/4969410075.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/nizavotezesanawogowew.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/aded.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/zeziretalo.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/vidudotopodudezojan.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/sipobitegibejolojobipo.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/98758684938.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/80094130448.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/12107659800.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161313bfb49fc5---lotebugibekukozirexedij.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/kugutegipaverawixatasil.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sunes.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/13069420703.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/sapiveseg.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/59092009665.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/jajafefuparuwoviw.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/pifunajewiwepubonut.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/12643755887.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/rasugiluwit.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/48871697478.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/fobaroluzojatipibevomus.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73623716142.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109011322576478.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/62275357029.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_off0000e719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF30 10204 bytes
SHA-256: 2246e40e72a5e8591ac2715be752dadb2b88aac7ec12d5b19a94a8fd793bbb27
font_02_sfnt_off00011632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11632 17492 bytes
SHA-256: 32dc8f6f0e2a9616ef2e03213b287f90c8e36b870760ad5be871e90fd46ac28c