Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1cf184f5959f56…

MALICIOUS

PDF

74.8 KB Created: 2021-09-19 14:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0ada2621958915d3ae73ada646bb51fc SHA-1: 9f38158c3f3dc177bdde44634ca197f658d69f3e SHA-256: 1c1cf184f5959f56bd4176d404ca543ebd5ccfba61c12cef2b132eea9fd25aab
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs pointing to a link farm, indicating a phishing or SEO poisoning attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies it as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://hissekurban.com/resimler/files/kasurodif.pdf In PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/kukizekebaterasirekux.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/lunilofusijujixu.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/bebabopadedek.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/89190528727.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/41447044801.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/44954442524.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/lekurolawobisid.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/56589368862.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/mojirasepar.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/mates.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/biwev.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3df9a15b5---58017223849.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210912063421.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16144f4453005c---dovabegirujijofi.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/30294641604.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/miponusujaro.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/77166394968.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/22259335813.pdfIn PDF document text
    • http://citranco.com/users/files/23260681736.pdfIn PDF document text
    • http://flexa.cz/docs/file/49972415831.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/xupesule.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/bigemuvuled.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/furomekeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mi+box+updatePDF 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_off0000c31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31C 16748 bytes
SHA-256: 542822de9249a803168627e8a22c18ef82b27f4487d8e8beaaa20a5d758c770a
font_01_sfnt_off0000ee7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 10300 bytes
SHA-256: 349fe3a9acaaff269c74ff4baac78633a49662a28b07487598aa5c6bd3dbfc31