Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaddb93916bdf222…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 18:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 971512bbfefb6b543f0d81c66d054461 SHA-1: 8eeeedca3d645bed2e75b06aa2137303d97fa6ee SHA-256: aaddb93916bdf222669d8dd124f7c94349144f27b3bccfe3a3b444bb37fb6577
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 suspicious domains and are structured as link farms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://vinmexindia.com/uploads/danifewuwi.pdf In PDF document text
    • http://jjw-led.com/userfiles/file/bozudakejisilitoxexadamow.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/kisatipufafobimixodepitel.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/jefuf.pdfIn PDF document text
    • http://carbontuning.ru/file/wenufikoverizamobo.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/82529227279.pdfIn PDF document text
    • https://12shio1.com/contents/files/39199004528.pdfIn PDF document text
    • http://poiskvod.ru/images/file/labubobatipo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613301936958d.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/37704565776.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109110516216772.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210910022629.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/47124179655.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/gikinuzefosupumi.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/siravenogitelikofes.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/81662079183.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/xegajek.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8af570ab5---44880569526.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/tezaduduxonamojuwemuvegad.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/jukeguwovod.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/jibatuzupobujabavadezize.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/wiviloxibadenaxuserave.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/4449042443.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/loludaputigipile.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/79010144877.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210914131004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+fix+not+installed+apkPDF 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_off0000d8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C8 17404 bytes
SHA-256: 0ee63f16dc1003e6411dd7e357da5dc7681bf3be478683185f92b98493229d44
font_02_sfnt_off00011d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5A 10660 bytes
SHA-256: 6d3ebaa5b444f0474d76ae3fee700a844d9bedeb0c604ed70d36803dae80b902