Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e7aeb563473947…

MALICIOUS

PDF

71.8 KB Created: 2021-09-27 03:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d85c517e7101b9b984c74efedce6db51 SHA-1: a76436d99505e3dcc59b1617e2332357f56026a6 SHA-256: 93e7aeb56347394703dc9ddacf9d374ea0c513b782ff9e4369c6de1aa8d2e3ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or credential harvesting campaign. The PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

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=cross+country+motivation PDF link annotation
    • http://nhatrangpalace.net/app/webroot/upload/files/gisifozatega.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/c7e64d00b21c04eb8b2a5811c9faf783/zolojufuz.pdfIn PDF document text
    • https://portoggitter.no/content/files/userfiles/file///xirid.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/datogilabu.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/sidibigubugoro.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/kusawajonofal.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuzumipavozupojoludusizob.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/pipipixidujile.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/dukubomutofatodubukawan.pdfIn PDF document text
    • https://heureka-cz.eu/files/49443523502.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/29986291178.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/wawiwiritikuligavujatafu.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/20101591827.pdfIn PDF document text
    • http://allasclub.com/campannas/file/94468726354.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/20669467103.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/5a0a53ae82f223a996504e2765f83ee9.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/medeje.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/binofibovadonanafolagi.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/xosanedonumoluvifi.pdfIn PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/29995930973.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/bivab.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb0576edf1---29821445391.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/61210910017.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/8013080731.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/zitoliludejonixat.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_off0000b608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB608 10524 bytes
SHA-256: c853653fc63896615e44596bc2186805801874dda3983d4c569ccc284e8bf3a2
font_01_sfnt_off0000ce0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0A 17128 bytes
SHA-256: d647727a25a3092e7669fc45bb6ea6c760d253c9219d0a3bd5bef434d6953d45
font_02_sfnt_off0000f944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1