Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63801a33e990a9a…

MALICIOUS

PDF

94.2 KB Created: 2021-09-09 10:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: efd29014aa79d873de500800f685c088 SHA-1: ec56139a53658a361e4e247cdf4d4f74e0822544 SHA-256: f63801a33e990a9a969cddd7588f54922c3b52e5c31fd0e1787f5c333f5c99ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is flagged by ML and ClamAV as malicious, specifically as a phishing or trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, suggesting an attempt to obscure the true malicious destination. The presence of multiple external URLs strongly suggests the document's primary purpose is to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9716

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://huntic.ru/uplcv?utm_term=reface+apk+mod+pro PDF link annotation
    • http://air-separation-supplier.com/d/files/xakuwanozexeru.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/41601923173.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/rimobodapilodizisoseg.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/raroba.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/73809189884.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/dupexejitab.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/fekixivozinewi.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/39441510283.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffb40cbf23---15745240231.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/nanekaza.pdfIn PDF document text
    • http://ausafe.net/images/art/files/6226468420.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/vunugapinatamiw.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/13210113214.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/fatexujowo.pdfIn PDF document text
    • http://apple888.vn/luutru/files/pimuxudokibaxadijer.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/67057130038.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/76709673300.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/fexot.pdfIn PDF document text
    • http://sooclose.eu/upload/File/zeritumarelituni.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/qm6nk113viuv03kpkg0bn1n6d0/63624575840.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/vovabegamirekis.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/92190635426.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/99529418687.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/nojupiwoxofik.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/muvapadi.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/budogi.pdfIn PDF document text
    • http://gysanya.com/upload/file/210906194654318090bjt19urmt809.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 24360 bytes
SHA-256: 9e47ed8c416d8c67d203aaf249dfd3b4ddfcf8eaefbe2b47796400054e7deed5
font_01_sfnt_off00011eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB6 10408 bytes
SHA-256: e0a1f5a3e20d000aea4991950d51b9113e1c8650cb864cc3efc09652d6e04289
font_02_sfnt_off0001364c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364C 16704 bytes
SHA-256: 8701ee17bc0c9f92f7f867c14b7ac194fe9e60e34699c6616214f5e52dc36530
font_03_sfnt_off00014e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00016620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16620 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc