Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a520fd0faf05f8…

MALICIOUS

PDF

85.6 KB Created: 2021-09-12 17:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 9ede07f478575adbb555d550ae8b318b SHA-1: c7fd29f2288ac1987e96635566f0261c16b05bdd SHA-256: d7a520fd0faf05f87d2b9fcf2db763f54396a2a1735bb4db92a5e9560f4a9856
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://valkexclusief.reviews/app/webroot/files/userfiles/files/33484206673.pdf In PDF document text
    • http://ebslang.net/_UploadFile/Images/file/lijalubujexe.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/6604762817.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/28573397956.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/fazosa.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/5821385188.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/98764111324.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/73989999275.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/lalisolizenupub.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/86263701749.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/zuxomot.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/bovuruwufukopumasapitokat.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8acd94c5---ridarobiveluzekozufutoj.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/99595976460.pdfIn PDF document text
    • http://krupongs.com/images/file/gavomomatuveguba.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/relevoxanajelusifopo.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/97849690147.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ba4ce229b---risujatolixomavupulinidof.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/5018550810.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/11493495509.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/javuzi.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/12043500349.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/79789603392.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/692044377.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/63184919545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=watch+a+quiet+place+2+online+free+putlockerPDF 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_off0000e8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EE 10860 bytes
SHA-256: 5b3864d296a2472a022bd6306938980df704dc52f6201149ae7db176986b26d7
font_02_sfnt_off00011a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A00 18176 bytes
SHA-256: 4d1f5a472c0ebe0d6fa2d214d30681ccd899bc45cf6ba5918eb713b301138055