Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef6149f9e6ddbb4…

MALICIOUS

PDF

84.9 KB Created: 2021-09-09 11:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c651abb1ebd19519f814bc29a9b84a64 SHA-1: b97f559334e096354447d4e99bd5fb7fac75562e SHA-256: 5ef6149f9e6ddbb47e188ad2b9c83b3334b434d35dcaf348c75a8c6ed800d225
174 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including random and SEO-optimized links pointing to potentially malicious PDF files. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF. The presence of a 'download button' lure further supports a phishing or malware delivery attempt, likely involving the exploitation of a PDF vulnerability to execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/zuwewuvesisamaresawi.pdf In PDF document text
    • https://888nv.ru/userfiles/file/dapazonubekujupamadugufu.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/gutunuzuvotaf.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/46799851730.pdfIn PDF document text
    • http://schokozentrale.de/idata/saxenezujofetazefox.pdfIn PDF document text
    • https://ibericadearmerias.com/file/56168109084.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/zekimifipuvu.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/nujugexelosojir.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/fokaseburixizagu.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/dibunikig.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210905092957.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/82856316167.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/53962338512.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/97858013757.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/lakotenexerajuvozokomiw.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/pezetivuwegurunu.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/wimobojor.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/66256114191.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/mamuwimaba.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613643eb53cee---morapegowizutulowifa.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109080907002992.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/legajobojisabapadob.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/90426413975.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/5358958129.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/kiwono.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/xobejilatafarutesokiwub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=internet+download+manager+free+download+2020+with+crackPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f1a7da73---ziwalexexanelajaxil.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_off0000e5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDD 17876 bytes
SHA-256: ca74f6eb62f845a469d66586a401515379deaa194660c54fff191cf0fa82d575
font_02_sfnt_off00012bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BED 11124 bytes
SHA-256: 04be9371524081dcf8f8f13ea67a48f0f57bb917772642cd7be26e5f02cc404c