Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ccb4f031d042c8f…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 15:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3fee2fc81413f41fe1b7c2a70140960e SHA-1: 4f244ec25210c744711c04feadfb9219a7054fec SHA-256: 4ccb4f031d042c8f9fa8ad7f5c5540526d612608b1ecbc180a393114db3d3173
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains or are part of link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ketchas.ru/uplcv?utm_term=simsimi+chat+malay PDF link annotation
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/kadijarowigofenamadudu.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614238c3a96fb---gekaranadiremekogig.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/volun.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/26922329350.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/xiradisunovifugoxodevike.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/61238542044.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/wikusiwuvewemiba.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/fifivaxuxijunawonajepod.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/kifik.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/fuwufepoxeten.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/34109223953.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/bimatusekilujome.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/beromu.pdfIn PDF document text
    • http://apart1day.ru/file/xozurapi.pdfIn PDF document text
    • http://aven.su/userfiles/file/xamab.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/92242009438.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/gumas.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/13971174513.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/89103962122.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/miwirezomo.pdfIn PDF document text
    • http://soupworld.de/upload/file/31873772503.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/84a46d1e638edd981180ae1392687a56/jiladu.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/59095615708.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/suzepunekinevoleb.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_off0000bc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44C 10228 bytes
SHA-256: e1a603d66e839e3bc34874c4eecb65b7991b4d136fe4440cf57cec406ba212b3
font_02_sfnt_off0000eb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 21252 bytes
SHA-256: a2f7dc55d28438ec83ad1fed48a0b93448c252c717806ff81deeba4b86e2d2c4