Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f8747c3b12783f…

MALICIOUS

PDF

76.9 KB Created: 2021-09-10 18:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fc49e0acdba7721b9392d2b92af10140 SHA-1: 6ac27282069c5b6b9fd0732f56def3ee7c19cc1d SHA-256: 17f8747c3b12783f5275fd2b429e70e69f1832fa6ad5eb9eb88389b1aa073890
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, suggesting a phishing or redirection scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on disposable hosting. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript for obfuscation or redirection, hence the T1059.007 technique is included.

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://soccerauquebec.com/userfiles/file/juzagub.pdf In PDF document text
    • https://syntellect.ru/Repository/file/99397024226.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/dinesetizipopatelizosa.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/81080960992.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/zovujubimebogenosuso.pdfIn PDF document text
    • http://remobudostol.pl/pliki/bavulek.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/nefar.pdfIn PDF document text
    • http://workontext.ru/media/file/dimaganerijivo.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/dorirotobewekuxasufegag.pdfIn PDF document text
    • https://agros.net/uploads/file/23515787547.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/lirekiwagifamuvu.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/mibaguworejil.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/jojaxevatew.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/nilikejumanemuwokiw.pdfIn PDF document text
    • https://sadex.pl/fck/file/pezaxosesawafadawoti.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/gogikazepotovobixotuzo.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/67fd51d365f3a543e5ed1b8a9ae2118d/59948146097.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/seluwewukusomimezoluti.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/98737235288.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/mafifozomekorekudutozu.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/runarudizojuzasanisaji.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a2142bf9d---zevixu.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/sukamisupufepotozejanidog.pdfIn PDF document text
    • https://proxus.nl/file/95037428142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=como+reproducir+mp4+en+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_off0000c5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F4 18896 bytes
SHA-256: 1a35e41cf622ded2526f9fb74633c170e2e28a4b6f3f41085aa9e220ecd22858
font_01_sfnt_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 10572 bytes
SHA-256: 656e8e02364a5c2c5feeac5c166f8eb315499913431ad5cd205393b655aa01c0