Malicious PDF — malware analysis report

Static analysis result for SHA-256 0952caf94a6369d8…

MALICIOUS

PDF

73.5 KB Created: 2021-09-17 03:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: db4b9ec8b61f18882019c7065d3ac47c SHA-1: 18fd111a2a48fccd66278bab8fd866f986d92f1d SHA-256: 0952caf94a6369d8a5b5f1e011cdf344af5e2d04ccd22b13c9378c3a4e35d1e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://coretry.ru/uplcv?utm_term=reasons+to+stay+alive+pdf+free PDF link annotation
    • http://toanthinh.vn/webroot/img/files/32499209590.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4010299461.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/rajanimeladerize.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/50152097455.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/jinutavagabudujisaxevar.pdfIn PDF document text
    • https://10s317.com/uploads/files/202108311809028299.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/12743022567.pdfIn PDF document text
    • https://ntc-container.com/upload/files/sedowivujerusazadelo.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/sirena.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/54921447197.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/62449978337.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143c1fe522f2---41823318003.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/xamatamasakefodijejib.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/jeletan.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/44607642158.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/pedowubibuvifole.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/89959515945.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/rajen.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/dororazi.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/vupexezukogaxoto.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/13572295333.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/xigetonitulavugiv.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_off0000bd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD89 16412 bytes
SHA-256: 44b7464b6fd9269b1fea251627c7990dfc12275765c78c0c34b438050e9b8ff8
font_01_sfnt_off0000e7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE5 10716 bytes
SHA-256: fd535faba0305c3a8d9656fb01071785dbb560d44f5f9d123f6f5b9d2d3959a3

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