Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f1badcc8b4f066…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 22:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29b62e88e3a559837caf7f84ebc2b615 SHA-1: e7ece40573514b421e83a4ec77e5375054928dee SHA-256: d3f1badcc8b4f066ace18621f78565bacda3b16784002e25ad33f32386c91cfe
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm or phishing lure. 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 content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://adirondackseafood.com/ckfinder/userfiles/files/31769724025.pdf In PDF document text
    • http://ndt-ultratech.com/files/77871832096.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109140502074646.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/tatuludogogadas.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465e2dddca3---38042735379.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/dulupuvixevalunurasixod.pdfIn PDF document text
    • https://jjpremiers.com/files/22346671877.pdfIn PDF document text
    • http://tulga.ru/editor/files/60608241578.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/24045930270.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/96190702257.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/momozevaboler.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161489eb0054a2---puwejufapem.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/zomunivulojimetotezefomil.pdfIn PDF document text
    • http://entrackintl.com/uploads/tibesezatubapinuroper.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/memebogot.pdfIn PDF document text
    • https://gdwtechnology.com/fckeditor/file/In PDF document text
    • http://eaupureinternational.com/userfiles/file/jipikoronoz.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/jevezufaxuka.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/8124552819.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/38665986029.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/tilure.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/pujafimunovo.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/mutetorapumunirepokur.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/92603291655.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/birusutupidezil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ark+survival+evolved+mod+apkPDF link annotation
    • 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_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 10592 bytes
SHA-256: ba40463242dba411e3f3cdf617b9543ce3470a1bcabd99b3b6819234b8a50bff
font_01_sfnt_off0000f388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 17192 bytes
SHA-256: 0ced272191005171f87e9cf14adfe19387fe715805cc99c0470f635836558333
font_02_sfnt_off00012056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1