Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde8a731d52d3bb4…

MALICIOUS

PDF

86.3 KB Created: 2021-09-12 20:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 446b2ad2a3566029279633936a92f2e6 SHA-1: 8723a024b5ca5f9ab7902bc5ff951e6c33189fcf SHA-256: fde8a731d52d3bb4322670e4087e5f5ac365962a66148613e63df5b50e9a6a2a
126 Risk Score

Malware Insights

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

The file is a PDF that has been flagged by multiple heuristics, including ML classifiers and ClamAV, as malicious and phishing-related. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=score+hero+apk+full PDF link annotation
    • http://licausi.it/userfiles/files/lejedajivefivose.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/kanatu.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/vobaxudomebud.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135c08442d4f---wefabudevoxuza.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/gorutaz.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/tumugadefixagobujid.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/tizomizijixofoginusirelo.pdfIn PDF document text
    • http://salespate.com/userfiles/file/10192611301.pdfIn PDF document text
    • http://timocomputer.cz/files/file/komuka.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/mijonutowom.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/57653272418.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/xexato.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/sitejubijikuduzol.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/jepugaj.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/10542650235.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/23325708460.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/tubonuborefisali.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/91623564489.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/92741628967.pdfIn PDF document text
    • http://logicamail.it/draft/media/jibudisa.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/wigifapaxolosawivaluxoka.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/nadagusovifu.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/xotobamitajovexosugagaz.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210912032217_YmVqaWdveG9waXhpcmltZXhvcGVuZWQ=.pdfIn PDF document text
    • http://gr-chem.com/upload/files/pukajuzumadivi.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_off0000ed7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10594 10384 bytes
SHA-256: ec2a3822d12b4d765ffd976dc334c852d75ede4850d020874e8c98a1d4fe7cc1
font_02_sfnt_off00011d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D36 17880 bytes
SHA-256: f57815eeae7ecc17ea049e7db54ddebdb284cbf4ec9710ec24d9956af04461e2

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