Malicious PDF — malware analysis report

Static analysis result for SHA-256 2369d4c991ff7746…

MALICIOUS

PDF

73.8 KB Created: 2021-10-04 06:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2c3ee30b8ebbee1b8b1b693c5cd1e373 SHA-1: ea8d0201ac7286b6729b71e8278f0d626ce70bc7 SHA-256: 2369d4c991ff77463eb84e6384c1e90bf3e1cc8a0f4e0af9a5d25b63d970c800
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to a network of sites, potentially for SEO manipulation or to serve further malicious content. No scripts were extracted, but the presence of multiple external URIs points towards a phishing or content distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kystar.net/filespath/files/20210906064804.pdf In PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/40710515333.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/furus.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/63744625199.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/38032675373.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/16126090389.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/niresod.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/65078388420.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/magilawirixureralaraxur.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/juvepefagapuvit.pdfIn PDF document text
    • http://langyupharm.com/upload/files/22123065503.pdfIn PDF document text
    • http://sswjeans.com/files/69696890984.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/2246012095.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/48059038919.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/bomolut.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/bejukobivugiwiwujuf.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/podififis.pdfIn PDF document text
    • http://usagimatur.com/files/others/lijidolugazatetozaba.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/zimelifogever.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/53614216819.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/geloguz.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/28207552737.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/32174259233.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/19cfef81b22267a5cd470f8fa323182c/12576151858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=outlook+incoming+mail+server+iphonePDF 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_off0000b60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60C 11104 bytes
SHA-256: 3435410ee72a9641ae967ea398e8f01c78273b90816a57bb9a7a1e1418642e85
font_01_sfnt_off0000cfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCF 19380 bytes
SHA-256: 39c5038db06ba6bd247b7bee8730ed5f4b2f451e0867c9d15e9df7363585e905
font_02_sfnt_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1