Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e418562a168f92…

MALICIOUS

PDF

84.4 KB Created: 2021-09-11 00:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0450661b69bb5922911decbacfbde9eb SHA-1: 6a0d7c580a4571dede74dc33967d5c58b68e0b2c SHA-256: 79e418562a168f92895c3fa6b20512894b2e804082b0c1d9663465d87d09b234
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is a link farm on disposable hosting. The PDF contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae8ace606f---69376031860.pdf In PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210904161518.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/zupidurupavub.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/32709657239.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/muzita.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/fagamevanifore.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/saregejotanekufulejopun.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/segizale.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/liroxagul.pdfIn PDF document text
    • http://jaqalsports.com/files/file/wituxudetidepada.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/lozemezojewubufirugiwedi.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/54031427488.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/vodufukizav.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/43380106755.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/diwulofesifax.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/xabuxi.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/kunoxap.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/lavuf.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/daxajubaguvum.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/xulek.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/bajifiwubepofiku.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ea54d9a94---92723107990.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/lunutowibu.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/68562591991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=1+trillion+in+millionPDF 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_off0000e683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 18468 bytes
SHA-256: b76f4c6a8224bdd2439ac9c6955c99795cc38dad6fb4398d9a02d3c232902826
font_02_sfnt_off00012ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE6 9764 bytes
SHA-256: a7d3a48664c45b444a32d0c8f96c3efa3c5d640ec13ce7b080ca06a15431c105