Malicious PDF — malware analysis report

Static analysis result for SHA-256 113b6666f7221303…

MALICIOUS

PDF

76.0 KB Created: 2021-09-10 01:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 13de83e8a3f15947ccca47f998304529 SHA-1: a52bce8912849f550dc771796cbd2593e66e6384 SHA-256: 113b6666f72213030e19c61b26f4992868d3db4d808bcb7f75096c028a4eac2e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to various domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious tactic. While no scripts were explicitly extracted, the nature of PDF exploits often involves JavaScript for malicious redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chiaranannini.com/userfiles/files/kivabevalaxew.pdf In PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/kurikositanokoxibexuvejij.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/99397884942.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/68746031206.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/2140608133.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/61725735907.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39273607824.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/25275210468.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/naxiwupupigisapexap.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/45178266828.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/baxizog.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/wozudulobepatu.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/68013976149.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/35579086172.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/maxepuziretisatumesed.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19669193143.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/60010361285.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/jupagotuw.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161362bd86531b---resoxolegeg.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///32063407958.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137d9431d024---20824956770.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/42927538411.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/tafipatititefavewopida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=sonic+dash+cheatPDF 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_off0000c687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC687 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 10396 bytes
SHA-256: efd7576a4812db4892838795d06092365bfb54e8a1410b58008599f1cf5e96b5
font_02_sfnt_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 17440 bytes
SHA-256: 57d30ff79df749b904fb111b76a65b3de30646ca92bf724fc406e1608c777eb1

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