Malicious PDF — malware analysis report

Static analysis result for SHA-256 0204b8e5ff9298ce…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 14:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b360ffbca52ed50452fa6e31b1963639 SHA-1: 606ed8743ede24d5f69f14c581d59ca2cbf3d79a SHA-256: 0204b8e5ff9298cec6634b32da5729df07b4e4d5c296a9aa1d6bae6f964dd587
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous distinct domains. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to direct users to potentially harmful external sites. While no scripts were directly extracted, the nature of the embedded URLs suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nemdanangpho.com/uploads/2021-09-01/images/files/jifevo.pdf In PDF document text
    • http://meubelenindex.nl/images/uploads/88699321016.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/wimimageperuw.pdfIn PDF document text
    • https://nocrime.cntwn.org/ckfinder/userfiles/files/tebadipad.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613173146fac5---dabej.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161313957a3854---soxefoxesule.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/75065872768.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/patiwuru.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/99080538447.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/53365419695.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/76262811712.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/30598582502.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/44918297922.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/judonesojaruvin.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/jokavijipalimidatikirav.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/11190709041.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/40981690192.pdfIn PDF document text
    • http://polipack.ru/content/file/najusipof.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/97925115354.pdfIn PDF document text
    • https://highrise.pl/file/66352307007.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/69354683593.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/vurarawajapadaluvalasapi.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35379313326.pdfIn PDF document text
    • https://akvaguru.hu/user/file/64055089183.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/lizenosiganud.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/motofokabimuvilasoxubajip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=watch+the+infiltrator+online+freePDF 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_off0000e885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE885 17892 bytes
SHA-256: 3a848c2daa948a198514e71bdfa188528ea1999af2776b1a5733493d3b3699c7
font_01_sfnt_off000116bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BC 10260 bytes
SHA-256: 4f1ba0f2061f46613512f9972aa52da239a41bf94a9050cc9e5ff3f0036a9327
font_02_sfnt_off00012dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1