Malicious PDF — malware analysis report

Static analysis result for SHA-256 248dc435189c1b12…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 19:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d761d6dd6aff029b1d6b41be607f119 SHA-1: 3e90b87e47dbba83e57421e161c73adfb3459422 SHA-256: 248dc435189c1b12c06e2ef73c5734ae150427a1856ae6b86ef9755ca0851e05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs points towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://elemental-ia.com/userfiles/file/67706843618.pdf In PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/birow.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/xorinam.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/80226608739.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/sefevofimeradifaxeniperu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea8ecb94d---sebirogisupel.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/44776036053.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/wulitebunureradasumux.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/suxaxemedivogafewerebul.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/peravunasubujiwujofuji.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/56536769338.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/xokato.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/84068946305.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/gikavafuririli.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/lawuvuserixotolifuduvuzin.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/zarefametoxuk.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/rezemikab.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/82474743860.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398d5f30a30---nixeraz.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/tiwuxaxogodabukexinewof.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/17135755046.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/43741113873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=asih+2+full+movie+lk21PDF link annotation
    • https://mediaget.com/userfiles/files/42890197691.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_off0000da50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA50 18392 bytes
SHA-256: 3417097a927553e2d7b24efbdf8a7004df3e52439d8031debf82da56691d0eb7
font_01_sfnt_off00010958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001216f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216F 10428 bytes
SHA-256: a179448989deb64ec01009cd74845f835a6ffb26b24922e175595e7cb2ed0da1