Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f498a8e32a8be8f…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 03:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 66a33c5582e74a82078be863dbc8160d SHA-1: 3d6a54d0cada0dc83c6dc5b92d96890175d17b09 SHA-256: 4f498a8e32a8be8f7d27639745a21e90405689ec4de7ffda0cd04ddf17876527
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of embedded URLs, many of which point to disposable hosting or are part of a link farm, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161408755be842---23191278477.pdf In PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/69188846557.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/83447268496.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/limetub.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20210902122618641.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/365504_pafopukimid.pdfIn PDF document text
    • https://12tiga.com/contents/files/62226095774.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210911094534_mspgbt.pdfIn PDF document text
    • https://glozor.com/userfiles/file/buxuvobudusivusidamafodi.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/pufifaxovigibar.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/wotiravemikub.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/mebepifujugosedef.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/63086880225.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/wafeloziwamakilirefufifaw.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/67218539404.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/77301838371.pdfIn PDF document text
    • https://e-midas.ro/files/file/bulemomezirixaginisonono.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/vunovexodejokux.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/vomekasozugaw.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/030700378535.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/sileputabose.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/22859067320.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/42546729307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pixaloop+premium+apkPDF link annotation
    • 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_off0000d4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 17372 bytes
SHA-256: 1c3d340da963f8878eda4195f9e65d59d371c461b9c98b879a9475b9f538484d
font_02_sfnt_off0001198a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198A 10340 bytes
SHA-256: 1ceb99fa871d2f811aae8e6095db6c8162306520006770c54c12411949c61d2a

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