Malicious PDF — malware analysis report

Static analysis result for SHA-256 98daa4e79bc10f5c…

MALICIOUS

PDF

75.7 KB Created: 2021-09-19 22:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6cc648a6f16a885e7505a13a8a9f20f SHA-1: a3649a601284cfb6d4c822f733bed923cb9be4a4 SHA-256: 98daa4e79bc10f5c0336048002d126a4290e13ed8f3d5d694f48637119df0b6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting or redirectors, indicating a link farm designed to distribute malicious content or phish users. The presence of these links and the overall detection suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=autocompletetextview+custom+adapter PDF link annotation
    • https://music-group-store.com/upload/files/89205719276.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/80403367439.pdfIn PDF document text
    • http://stl-hk.net/userfiles/zoxovivemozuwujo.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/dopawemupokizoz.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/texenesivuzesukowefelum.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/mafal.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/jogonugenajevolon.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/faveniwoxelimarapa.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/97363569462.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/49170870408.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/jejefexagavuw.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/kixuteberapetuwiduna.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210901151205.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/68040911212.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/tefurabagexomusunefased.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/jufenafawofobitevotem.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/46616586693.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/12243375200.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614412ea634fb---70939879313.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/31662542511.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/pativovisujisexunanejozu.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/54173100325.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/lepusawoxawaliboluvapama.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/52824344217.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/6664637362.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_off0000c2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 17252 bytes
SHA-256: 576652b0a6ab3d48b430ca3851316372e117a765de080e251ecfe7286c929236
font_02_sfnt_off00010786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 10904 bytes
SHA-256: 8ffac1321074c974a8eb8315fbc4979ef5e2c48be4342a8e7a30e60a6136e6b9

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