Malicious PDF — malware analysis report

Static analysis result for SHA-256 8621d58250d1b0dc…

MALICIOUS

PDF

73.4 KB Created: 2021-09-20 11:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b65ca8af7984ee64a90fe16b0744b0fd SHA-1: ed4f6abdde3f539372bba0e8d774dd420670eaa0 SHA-256: 8621d58250d1b0dc9585ad00bf4935f2ae4405b91a068de468a847ca0d837efd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. It contains numerous external URIs pointing to various domains, suggesting an attempt to redirect users to potentially harmful content. The PDF structure and embedded URLs strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://pixomot.ru/uplcv?utm_term=solitaire+tripeaks+2 PDF link annotation
    • http://dorapeyzaj.com/userfiles/file/68592320657.pdfIn PDF document text
    • http://skomi.ru/img/files/file/zaxobigogopuredakotitel.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/wixibune.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/bijewigisinuxuvegojan.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/taver.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/lalika.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/dorelejev.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/julive.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/25385611740.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/dufetusoterewulunufopew.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/23872829484.pdfIn PDF document text
    • https://pecintajp.com/contents/files/xizomedajubafope.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/24714042774.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/jereziz.pdfIn PDF document text
    • http://hkwwta.org/userfiles/sataziro.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/kebilafumusekutim.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210919174724.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/xutizesapovo.pdfIn PDF document text
    • https://nada70.org/userfiles/file/mofobumibus.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/55722211832.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/wuvaredasix.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/53400679464.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/fazobuxusaruwa.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161314941b1b6f---najavujuwosa.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/23957139019.pdfIn PDF document text
    • http://manu-transport.com/documents/file/rerafujovixunidexopa.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/nuzamegerusejosefafa.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_off0000c02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83E 15548 bytes
SHA-256: bd50d7fab137613af45bbcbdda6776d2f04336c659ea23a9c22255128d13e6f0
font_02_sfnt_off0000fffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFE 10428 bytes
SHA-256: fc4a0c06a5c82cb8504acdc9944a2f4ba608c8baba3bdbcb61580346f9152f58