Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be8fa9698bd0fb1…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 11:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 440977076882eb446ca27dfad18f50a0 SHA-1: 7fede0d6193b2bccd3cf565e1480f5748eb85fde SHA-256: 5be8fa9698bd0fb1d09168b960e50b073ba7c545cf41d7c8eecc07702558db1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to form a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used for malicious redirection, likely to phishing sites or to download further malware.

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://pixomot.ru/uplcv?utm_term=emulador+android+para+pc+clash+of+clans PDF link annotation
    • http://pngroup.pl/ckfinder/userfiles/files/rarurugovalusetez.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/kuvemubewusek.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210903_0372AEC0AB57AF4A.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/21168677436.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/finokanuleparelanipuli.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f259159afed006757208e3844d5ca5fc/46579422672.pdfIn PDF document text
    • http://turatabor.hu/media/lozoweretas.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/30374906520.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/jerif.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/bulepogulitepa.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/zakatevamonadupivizowofu.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/84040787790.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/bomidefu.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/14412472638.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/sojibinosa.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/46723039181.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/pifaruvuji.pdfIn PDF document text
    • http://prompol.com/media/file/9854849110.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/bugesipemoroxirim.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/17166290117.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/42051921285.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/novixolozefudewaferix.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/nodebofabupesetakogipife.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/54150821167.pdfIn PDF document text
    • http://aurora-c.jp/files/files/dumeramubunisitepuvojut.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_off0000d838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD838 17252 bytes
SHA-256: bc21dedec8ffad4c8f66dd2138cb6ef79f168cf3d21dfc8ed243c8fa4e90862e
font_01_sfnt_off000104b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC8 10736 bytes
SHA-256: 3f8fc38c4ce454cb684f90606db65381c23e61ec16516f721c6e5e89b74ddd18