Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c37e44cfacc7d90…

MALICIOUS

PDF

87.2 KB Created: 2021-09-13 19:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e1b340b9d955ee21921f8b0fffe1fe2 SHA-1: de40559491f35f5536c88c297c04f25ebd98256b SHA-256: 8c37e44cfacc7d902a6cd56f6f97636c0d40e04870e4b7d873dddd420aa6e6d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to potentially malicious PDF files hosted on various domains, suggesting an attempt to redirect users to a phishing or malware distribution site. The presence of numerous distinct hosts and disposable domains reinforces the link farm characteristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pointwebhost.com/calisma2/files/uploads/68387700943.pdf
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/voxoxamuposalawemefebuve.pdf
    • http://matsusushionline.com/uploads/files/majofebud.pdf
    • http://tagsu.com/attachments/fckattachments/file/dowodobelufune.pdf
    • https://777mto.info/contents/files/fukomewi.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161335671c0252---42794893005.pdf
    • https://sport-jicin.cz/dokumenty/vikofeneg.pdf
    • https://ozmutludokum.com/userfiles/file/76349338302.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/cd89f6ae6b47db85f861f6d5d776018e/monijufane.pdf
    • http://emekyesiltepe.net/images_upload/files/vawas.pdf
    • http://chingyi.tw/userfiles/files/dagaboveroxidomu.pdf
    • http://www.cenlafilm.com/siteuploads/editorimg/file/fobegakovefagiri.pdf
    • http://ristorantebiscione.com/userfiles/files/futatofofisesodovazarez.pdf
    • https://t2sc.me/userfiles/8865440864.pdf
    • https://fo-prefectures.com/pages/files/11128804018.pdf
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/56420228003.pdf
    • https://tattica.byespresso.com/app/webroot/files/upload/files/bamukotizedabogagukavi.pdf
    • http://sanfrancescovet.com/userfiles/files/dodekowuxazolex.pdf
    • http://kssi.ir/public/userfiles/file/leranozuwufijemuk.pdf
    • http://veoguidecostarica.com/ci/userfiles/files/kugisisasoviginewom.pdf
    • http://congluc.com/upload/files/welowomepexezanopugukofi.pdf
    • https://cplastik.eu/data/cms/file/68074281414.pdf
    • http://80tner.friend-match.com/upload/files/rajadewaxejilanazik.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+make+a+chatbot+in+android+studio
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e96f.bin
cef3041f0dc5934c7541012fa47de34876398d7780f6128e3cef03c512bd3453		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE96F 19764 bytes
font_01_sfnt_off00011dde.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDE 16792 bytes
font_02_sfnt_off000135f5.bin
cbd49bc86719ba7ae114f9cfa7cdba66b24b39ba637ab6132d43c2e98bb4db9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135F5 10996 bytes

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