Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ac5bc2c4dcb7c2…

MALICIOUS

PDF

72.4 KB Created: 2021-09-27 01:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ea8874067abd4dd27eddebbd92becff4 SHA-1: 63586330f2b9f7e6c9c220669f32cfe68e0f77bd SHA-256: 96ac5bc2c4dcb7c2bd273b21632d63d559f2b6fd5f52518c58ad491203b8d362
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=recover+deleted+text+messages+android+no+root PDF link annotation
    • http://rent-lease-no1.com/userfiles/file/20210919044208.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/94383911578.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/xekoziruj.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/94184488279.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/19989966463.pdfIn PDF document text
    • http://tiquital.com/documentos/file/xugesosokarurujegulugudi.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/waxerajinubejubabizibup.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/tonarugugukewozulakado.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/39197389427.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/4325016879.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/gazimigikobuduv.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/dosigodogevurepemem.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/50403274958.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/buwep.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/60643521888.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210921065531.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/xiladonosaba.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/35369917100.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614964fc26223---50205642615.pdfIn PDF document text
    • https://ibextrail.com/editor-images/69070599037.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/nupugatuta.pdfIn PDF document text
    • https://alohasafaris.com/files/67191266364.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/13084507688.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/livedefaxawenun.pdfIn PDF document text
    • http://secoinblock.com/upload/files/lezobepuvikok.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_off0000b605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB605 17396 bytes
SHA-256: 5484b725597e3a148f06068c2e871f1b80426c5abf43a4bafc83f0e7d8efbc0f
font_01_sfnt_off0000e238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4F 10928 bytes
SHA-256: 6e834968d95aeed955fa860c30a3bbfdff15b09478f3de9fd65f791fd1952f02