Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6548490861eab2…

MALICIOUS

PDF

68.8 KB Created: 2021-09-22 16:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0efbc19cdcda49f4a3bceb64e7ec4ec3 SHA-1: ded04c5a98267fc6630c238cc5683b1fd27829e1 SHA-256: 6b6548490861eab2a3ae11dc763c57075779a75b1093a27a62f9a9debbf8ca16
126 Risk Score

Malware Insights

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

The PDF sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or malware distribution scheme. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://needlugs.com/userfiles/files/35023881839.pdf In PDF document text
    • http://anpo.vn/upload/files/fopimujawibexepewopefaj.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/14285155701.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/74631983308.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/47409391358.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/vumejoza.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/jupekekageju.pdfIn PDF document text
    • http://baove24h.org/upload/files/34976207571.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/58078349440.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/zusaset.pdfIn PDF document text
    • http://edallyshop.com/upload/files/54676245778.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/jonil.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/52856747850.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/56547943772.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/rijuzovugokoboxafetadizo.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138bc4c94168---pinurifix.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/nugekigavubagerolot.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/movojakinotukimibalap.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/lifanodefewurojemubapon.pdfIn PDF document text
    • https://diphong.com/uploads/48219867408.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/befepolikevet.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/2048814461.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/woteresife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=omegle+free+video+callPDF 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_off0000b165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB165 10540 bytes
SHA-256: d7dbe48f477929b20d21c8ababa47872d55b6a7caf015f99c35693b558c186e7
font_01_sfnt_off0000c939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14B 14604 bytes
SHA-256: b059f16e6cb74a4d0feff064cbff6b7d79c3a2654691fef34186110085d0289c

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