Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff64867b1c25dee8…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 11:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c0d020f5663ddf5456cb0c1acb70acf0 SHA-1: 7d26d7a3f2df1a29ca743ff2313e3022f7ec9010 SHA-256: ff64867b1c25dee82ae826dbdc9a3031a517e49f40a70b7d13219f66335fcc1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, with one URL specifically mentioning 'secret+neighbor+free+android', suggesting a lure for potentially unwanted software or phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://smidgel.ru/uplcv?utm_term=secret+neighbor+free+android PDF link annotation
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161457ea1728fd---22267547352.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/zixejaseroji.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/dakilox.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/70751763634.pdfIn PDF document text
    • https://sharenkon.com/files/xozuperuk.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/45070017219.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/sarer.pdfIn PDF document text
    • https://rm-parketi.si/uploads/92544822014.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/59701160757.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/lojogitatopubeneme.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109170446513727.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/44279967965.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/86933321706.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3eb6823fa---43326877501.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/17236999989.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/tefirepezevegunopawonuk.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/88597727513.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuxel.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/65562251578.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/14479378640.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109051808351237.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/zutenur.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/59896101034.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kelerusaf.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/wasofegutuxebofagelezeka.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/tegaxepobuzasiw.pdfIn PDF document text
    • 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_off0000d39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39A 10756 bytes
SHA-256: 43d46f022e1e6501b90f72178c12c8ca65a71c0e15d642eb6357d2cd5f622f8c
font_01_sfnt_off0000ec13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10425 17904 bytes
SHA-256: 67ecf5d62194091bb00c1955d09dd8498c5c7f8d8c3b2823b6c39244317005f0