Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf2b96544abc7ff…

MALICIOUS

PDF

90.0 KB Created: 2021-09-17 03:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2fb5d7c534ff828ea4e451a0e2b6adde SHA-1: 7b924437d61f3818853ba4c06d523dba10c44c54 SHA-256: abf2b96544abc7ffbe606c0f173b8328a27a8ed90d1a1a3c64f59330d0c6bbaf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates these links are on disposable hosting, further supporting a malicious intent to redirect users. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://qiangka.com/ckfinder/userfiles/files/59938700433.pdf In PDF document text
    • https://gmnavarra.es/ckeditor/files/8440030048.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/zolinijerakuda.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/85191271216.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/56937040489.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210910221347.pdfIn PDF document text
    • https://umutfm.com/resimler/files/29245779308.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/83017604459.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/walaliziwoboter.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16132980b4d7b5---205194347.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/20876916989.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88267305827.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/wezowunevasasasefo.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/wetizewatazikew.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/pidavasotegafobi.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/xogina.pdfIn PDF document text
    • https://gulamanis.com/contents/files/70168195730.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/jukufetilodapi.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/75750868886.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/xuxaviba.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/41210566508.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/bugufoziwavenenijone.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/5429436877.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/toxogutaninaripoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+to+put+in+subject+line+when+sending+resumePDF 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_off0000f60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 11412 bytes
SHA-256: ae4abfee2ec8b38db5bfe358fec0beed24ac5132764b8b1511ef3b37c31899fb
font_01_sfnt_off0001105d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105D 19040 bytes
SHA-256: cc7bad88f8353d5d9176b8cc5956e8e5be340ef1fa8664bb636302d9de053d98
font_02_sfnt_off000141b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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