Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec2170c829387c6…

MALICIOUS

PDF

88.3 KB Created: 2021-09-20 22:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b0120c880866101bdf7f7898c7902c0 SHA-1: 16aa0a7d1ddaae1f0e02d8fc033d4f1fdbd570db SHA-256: dec2170c829387c690e2d35fab2afc1cb26aa0cbd82c6be9a11aec0e82cd8b15
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs extracted. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://muacash.com/webroot/img/files/xukumakesapijimu.pdf In PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/74114661054.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/sekaxuvoz.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/51114468612.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/6257618059.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/753ebec8c32c7549f88f5f0ee7b124a3/96240134380.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/zikewomuwiputilenoj.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/mejaroturowed.pdfIn PDF document text
    • http://fitviewer.biz/files/file/sulerikefepodajig.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/bubaj.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/lerezivomomofiso.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/ravate.pdfIn PDF document text
    • https://majubesar.info/contents/files/tesirekotoboxekogunajoki.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/jokejopunumirad.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/47453364037.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/zatadeba.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/6757629256.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/66743851542.pdfIn PDF document text
    • http://splogservice.ru/content/files/vekokigogadodu.pdfIn PDF document text
    • http://taociren.com/upload/file/210906091906400127gzi4i5lvh95n.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/20126412269.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/gisudatibobulikifosine.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/wisoturilupumanopoxak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=redmi+note+7+stock+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_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 18424 bytes
SHA-256: dff89ce8554da274b840b249e934f1b8cfd9ca7aea1b8d3c7b71781450ab14f1
font_01_sfnt_off000123a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC0 10672 bytes
SHA-256: be633d2e845482b118e903124b524d96a5028b4b0092c24005ba6e1e5ffedff5

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