Malicious PDF — malware analysis report

Static analysis result for SHA-256 e707c8776f831fa5…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 13:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8da0393eb542583abfad3410f2f33423 SHA-1: d8e0882fe7b98e34da6703a76dcd8e93d4cb2488 SHA-256: e707c8776f831fa5e23fd8b374a6e3e2fa907005d64e76f5d0c24d9a74bdbcad
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 0.9953

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://assessmentinsight.com/ckfinder/userfiles/files/meviduwoxubatusipawu.pdf In PDF document text
    • http://dalaichau.com/files/82892650604.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/tazar.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/92353820156.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/lijufudajisosogufaze.pdfIn PDF document text
    • https://vendax.ro/files/file/99012060590.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/72967156559.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/58625731986.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/12928877894.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/karomagadotife.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/bupafewudowegerulesod.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/80043601224.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16306288209668.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bb30d796b---6473779153.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/vekajutusosuvuxop.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210910004703_klhl6l.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091311074875.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/6568389711.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/34577324857.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/63785027944.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/pitokudutab.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/48060215456.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/98754397543.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/susesenoguwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=influence+the+psychology+of+persuasion+revised+edition+free+pdfPDF 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_off0000d0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B6 17812 bytes
SHA-256: 87b3b3241bd9c68744c9855eea50623fcaba0430d613878a5a96906bed1b976d
font_02_sfnt_off000116d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D9 11128 bytes
SHA-256: 63aeeb7b48001c31e73f7abf464ec12be8f5c836f2161c119a6bd5da93d5b895

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