Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd36567ce47a69da…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 09:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d9b79bb6dc0ee261da63485711d6706e SHA-1: 79c0a1ed6ed27f12d960289d33ae8ff49f125b9f SHA-256: fd36567ce47a69dab0b6b7c941c5feeae0bc3ba279db866c84cc860d10aab06a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identified the document as a link farm on disposable hosting, with numerous links pointing to unknown domains. The presence of many embedded URLs, some pointing to potentially malicious domains, supports the conclusion that this document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mldom.xyz/web/img/podborky/files/zefidopesokegib.pdf In PDF document text
    • http://apex-architect.ru/images/file/nuziperelanarijuserepela.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/bixikuzobiridatugovubuve.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/jemigomogupomedugap.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/19139381418.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/dupexibezefudusobukupa.pdfIn PDF document text
    • https://vientangluc.com/upload/files/70966762690.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/gazoluwagojamuwafimowib.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/javavokimowutisawixixe.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/8655880982.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/88140539010.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/vavupamomejubujukowu.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/mogom.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/46473502312.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/74258330371.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/vegolikufajosotonab.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/jopojo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402a503aea9---buzewedosabudekatukuru.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/11329378871.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/nudofewawagudatezolototog.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/85627091876.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/28397030105.pdfIn PDF document text
    • https://nada70.org/userfiles/file/vabegojinanovozugaregi.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/41954704414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+see+screen+on+time+androidPDF 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_off0000de6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6E 17560 bytes
SHA-256: d340e5e79f3f21a66883bec2d1a828b259d17c1690f3fa7fddf5f59aa9089667
font_01_sfnt_off00010c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12436 10560 bytes
SHA-256: f6aaf80efda78f85ea6a3b0962822160969a9a146320e6c0d4305818faa8ae9b