Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9aa262484634619…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 22:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3cc933ee3eca3bc1cb0a9a1011b04382 SHA-1: d2f0203193e9c763a5b5082258daab969ea10801 SHA-256: c9aa2624846346195dbf5cf9ee0594c09a16cfe2e21441d9de9227567036810b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. The PDF contains a large number of embedded URLs pointing to various domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=last+on+earth+apk PDF link annotation
    • http://dcbestwings.com/uploads/files/6352826741.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fevivivugom.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/niwubipopelasofupagul.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/41795142154.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/bavowekenodur.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/naxobamefoborado.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/76940781378.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/6170708372.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/gotijinorelulelatemad.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161364a8959d43---1023262786.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/dogosudeju.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9981161457.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/57164269118.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/27815722345.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/dozepewafanumikakugujigez.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/61997641414.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/2641ed67cd8d212782dcee5cd2f7b3b2.pdfIn PDF document text
    • http://citty.org/images/uploads/file/gawomazabude.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/nugewo.pdfIn PDF document text
    • http://skolky.info/foto/images/file/40363043830.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/88259802311.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/lofanob.pdfIn PDF document text
    • http://sksound.com/userfiles/file/36467899467.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/93031206652.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/32614560412.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_off0000dadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 10260 bytes
SHA-256: 2b2b8ac4bb2baa4327bb3751c8084e8593ca6ad0e34b9412ebd77ad3be917599
font_01_sfnt_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 18680 bytes
SHA-256: d589be4be38786772f238e698fa71107aaffb7879011463ed08aab246d9ab697