Malicious PDF — malware analysis report

Static analysis result for SHA-256 88dbd8d98965ba61…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 22:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b2de54d4d65fee02403be7c6eb82eb83 SHA-1: 36fd0d4281d2511ae6aed24dc5775df91b44ae5b SHA-256: 88dbd8d98965ba615bb2a49523faa718c1fa2c57de9bcdad5b55c803fae528b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting a link farm or distribution network. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, which is common in phishing or malware distribution schemes. No scripts were extracted, but the overall structure and URL patterns point towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://aerotechgroup.ru/img/outer/files/lowilakonuboparavife.pdf In PDF document text
    • https://conrays.ru/f/data/79164569376.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/66994436906.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/43178119091.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/gebomajabifolaved.pdfIn PDF document text
    • http://gurmanosypsnys.lt/userfiles/file/99706651390.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/8257394540.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210912225146.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/topavudi.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/xovomo.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/tivudarazesexapakigebuzo.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/37741594833.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/midibiwafatose.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/gizoponopodafib.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/gofibebinegozejamasut.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/jolukugavesud.pdfIn PDF document text
    • http://bluebossa.pl/files/file/setejuratetokamegizip.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/komawovevawibawop.pdfIn PDF document text
    • http://mrybalko.ru/files/kawigig.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/patoxaj.pdfIn PDF document text
    • https://ocw.tw/uploads/files/96692905268.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/95914195532.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614efe3307188---lunavawitovenifedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=trick+to+increase+instagram+followersPDF 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_off0000b055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB055 17704 bytes
SHA-256: 228a10b989c7b8b8b3c3e348c18855b457059d1672a35505548542e91fa5cca8
font_01_sfnt_off0000ddd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 10820 bytes
SHA-256: 24443f0d62fcc34484da8903ad12469dd71f8dd4016fda9e2a3afd3afcb7d69b

Open this report in the interactive analyzer, or submit your own file for analysis.