Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf6e488d35e226e…

MALICIOUS

PDF

74.4 KB Created: 2021-09-18 18:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b62f0784461c4f368cb7a0dfbd97b680 SHA-1: c9b16c998401c450d0baf130995fb7f6770f04d1 SHA-256: 9bf6e488d35e226ed163dd7b8b2a66cf6f205ea2ef33548a04f88d392231bcac
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the nature of the file suggests it was delivered as an attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://hizlipin.com/calisma2/files/uploads/kusol.pdf In PDF document text
    • http://bakefruit.com/uploads/files/202109160019576689.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/tidezuloniwi.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/xumuvewuwemaloxoleluturej.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/wutabim.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/34844793919.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/22166276782.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/9237328186.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/tupexowo.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/towetizejosabaviwozi.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/xipavexuxexupipagukorid.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/94474944165.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/rupefe.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/sifogamozubogox.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/wifogo.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/xanirigutelisafulipiwuraz.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/zavugukajefife.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/duvagar.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e079b681f0---marivasi.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/jimikoneradavodejed.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/18343298521.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/71943487020.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/60315333379.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/wimufugapewinotetaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=free+movies+plus+firestickPDF 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_off0000bc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD480 18304 bytes
SHA-256: 498c1ab3e2501f13088a569150237048885f9db0546a803ae772bfb0feff905e
font_02_sfnt_off00010429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10429 10608 bytes
SHA-256: 35a591b254949fb7265dc0fe488eadc2f38b60a7ec50a0553ff1bacb0377ba71