Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e0eadbb365078d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 16:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c134d2fc783c989f6a6eac402487b6a4 SHA-1: 1d96876b833770e445059d2dac4c1115dee4d76b SHA-256: 31e0eadbb365078d29e1c5f8b7520fa6392d2bbe7f3f047219c5bc536cd2cc40
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm and a potential invoice/payment lure. The presence of numerous unknown URLs suggests an attempt to redirect the user to malicious sites for further exploitation. While no scripts were explicitly extracted, the PDF format and the nature of the heuristics strongly suggest the use of embedded JavaScript for malicious redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pezenasenchantee.fr/userfiles/file/sopepafesosetuza.pdf In PDF document text
    • http://metalzilemboeventi.com/userfiles/files/58660334072.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/42921263665.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/timin.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/juxatumumateke.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109132002524711.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/begokurasux.pdfIn PDF document text
    • http://teresachild.com/upload/files/85863212256.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/50475390547.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/mudimubolowotikap.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/13597324827.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/14346721740.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/notutakovis.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/difojazuna.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/75011785451.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb61753762---duzilupigetixagafu.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/febori.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/sujefewelofomixudulur.pdfIn PDF document text
    • http://simonide.org/userfiles/file/wapopubisozofu.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/41922184461.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/47949171574.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/2549404443.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/nusupuzijubagafinovos.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/kuxavodulolewive.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/nagudovozuruperad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sims+freeplay+unlimited+money+android+2020PDF 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_off0000da35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA35 17176 bytes
SHA-256: 4016ab9993c960b9d7d809661c1e8adfe296ddce906872b45951d55ce531b4b7
font_01_sfnt_off0001067c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 11192 bytes
SHA-256: 52c89d498f8538f4365761534bf2f0bd629fba47ec9b481e4a303624a79fa600
font_02_sfnt_off000120ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1