Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36d4b46e1e4cba8…

MALICIOUS

PDF

73.7 KB Created: 2021-10-01 19:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4250eb25aec720f2c0682d29d1935af2 SHA-1: b659ed2796a644d6a353a867a3d43f5f43d08c4f SHA-256: b36d4b46e1e4cba8e0ca616f485ab200a6089b117bb106cef70639192a079a25
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further payloads or leading users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://myesen.life/userfiles/file/sibuxubovubusikaxazilibos.pdf In PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/nowaxixibeliroxorozet.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/17823514967.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/temitepaposizogajudawavox.pdfIn PDF document text
    • https://maria-galland.ru/files/file/54179582952.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/72813956703.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/94047639678.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/61173624696.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/kusudebalej.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/23915683428.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/lizanexofosemelizikaj.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/25072080352.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/piwadapopulafiza.pdfIn PDF document text
    • http://szm.hu/userfiles/file/xujobopibiwevesobe.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/ginerifowetulejiwedodunaw.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/rekanatogejezewenisoji.pdfIn PDF document text
    • http://ustunongel.com/image/files/38216341389.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/33365289411.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/keralugetipu.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/182820205061371d5e068f6.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/muriz.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/33210542866.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/62140575127.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/zizamujejunuwixufavuw.pdfIn PDF document text
    • https://tivicom.vn/upload/files/42874017406.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/20762975356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bhagavath+geetha+in+sinhala+pdfPDF 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_off0000baea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FC 17592 bytes
SHA-256: 84456f5430a333cc59e5e1a7f8020acb3470eaa27214c7209cb8142af645d5e4
font_02_sfnt_off00010048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 10676 bytes
SHA-256: be5f02eac19283e0f7f7f1f18f600d1d0e7a80f9c5168a530e8311adfc687a3b