Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8096f0ed9b447fa…

MALICIOUS

PDF

78.0 KB Created: 2021-09-10 05:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 5a7d7ac4ed47a9c7a850e6711a7dca1c SHA-1: 4db59367cb117f9b410253a5f670aa9ec6d5d2cf SHA-256: c8096f0ed9b447fa5330dc4efc4c288970e8b2baf75a5cd6d3510ab046a5a7f1
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=my+iphone+is+not+connecting+to+cellular+data PDF link annotation
    • http://jadever.vn/Images_upload/files/werodu.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/14530036413.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/ruxafotaw.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/96819861901.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/45597beee02d246bc7e489e9003ae87f/99986586806.pdfIn PDF document text
    • https://renault-service.com/userfiles/40942345467.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///kisudugasatifu.pdfIn PDF document text
    • https://fultoys.com/userfiles/65993488479.pdfIn PDF document text
    • https://reha.bg/content/upload/file/26489529114.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/77721588866.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/pupagarelovanilenir.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/dalewekapuxawol.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/73392430171.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/tagiwirenomudijexirinesex.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/zebuzubexasituxamo.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630454771/files/vavozusosorediludugolej.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/75610020138.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/73370823424.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/kekevofidusipesisolewu.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/95893461821.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/zarovafimabitudosoge.pdfIn PDF document text
    • http://tecksco.com/upload/files/zavutukibif.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_off0000cb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 17476 bytes
SHA-256: 0dc0237604d4786ae28fd20346b6b3a6104b9c833471f9d6453c06d33d542a42
font_02_sfnt_off0001108e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 11000 bytes
SHA-256: c896eb73b4786bd69929baa4aa1b4ab88d140d154e64cb35c9de927604291480

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