Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbf3b56ebb91d2c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-11 14:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 806d5a9d1575ce6bce27ae7f267b2d3f SHA-1: 66ef7116396ff75e405ecc941dcf70a861c8a831 SHA-256: 0cbf3b56ebb91d2c1c791b964e36dc78688f56f3f7031c95d5941d0a48630f3a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is a phishing or malware distribution lure. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=battle+of+warships+full+mod+apk PDF link annotation
    • http://chongros.com/userData/board/file/2773672189.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/58052086457.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/wugobefaziwepixas.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/29277116453.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dbeg8s2go970jv3ikfut7gi3j0/75531147699.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/86949966769.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/rubopimemujowek.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/bazizabi.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/38847012427.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c77d02cbef403cd3d20a2d367debc837/ligowipegazigi.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/valelulepafemi.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/29905126337.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/34502058736.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/62211522298.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/seketotofogiv.pdfIn PDF document text
    • http://adveotec.com/img/file/95443800387.pdfIn PDF document text
    • https://orrizon.ru/images/file/29599776418.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/gibomajojenuj.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/gusitiwegavisipawesujuli.pdfIn PDF document text
    • http://katela.net/userData/board/file/43168883596.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210907031448.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/10666152517.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/20852976988.pdfIn PDF document text
    • 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_off0000d6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 10988 bytes
SHA-256: c648579c26a9eb9d09bc2ce730b5613a2ff299caa7ccafc064a71c05d79bd11d
font_02_sfnt_off00010893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10893 17560 bytes
SHA-256: 71badc4c5483491130de95f8d1f44e8b493a21b4de2e74fda82066eb020ffeed

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