Malicious PDF — malware analysis report

Static analysis result for SHA-256 3937b9ba320ef8ee…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 21:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f5359669b772ff6b2f7869fa1acdacd3 SHA-1: 24d53d704660ba07f625bafbb2c2450a3a364232 SHA-256: 3937b9ba320ef8eec4a10589c451330e37a7c92cd6bd9ca873917480e901ac34
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links on disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://studioguatta.it/userfiles/files/panajenugujosine.pdf In PDF document text
    • https://gencatakan.com/upload/file/pufadodivafokonajezagezi.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614449d946a0f---xalekizega.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/98971920940.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/xurazas.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/sebekovanironizefok.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/mobarisa.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/17822088709.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/wutamewogavawatepolaxa.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/sowimipabodeluxemupafuke.pdfIn PDF document text
    • https://wmu24.ru/media/file/8193577969.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/64126505028.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/35148738528.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/29cbbc0c2dd0863fe8f94f82774408a0/48578800838.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/rudukebikixeravalij.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/22430296037.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/59659724110.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/12163520480.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/6506957149.pdfIn PDF document text
    • http://imi.vc/upload/files/61926010482.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/piwunedimivotubexerot.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/fozipefit.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/pujafijajajedujasurorub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+find+pictures+on+sd+card+androidPDF 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_off0000e2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BE 18712 bytes
SHA-256: df9fb216908097559bf73902407152703a08c90921c708df3a813362e6f6901d
font_01_sfnt_off00011348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11348 10744 bytes
SHA-256: 57f61b0390f4247520cc5ebc724f655de85f335fd2381d6d4ef09055e09a6802
font_02_sfnt_off00012c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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