Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5cf70a68e4d7f57…

MALICIOUS

PDF

76.8 KB Created: 2021-09-20 10:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 85666a03073ea85731e9926a365d754e SHA-1: ecb2b225965d79ee66aa8657be5f1ed0439ad982 SHA-256: c5cf70a68e4d7f571031da5ccfb520947d37b1fc017e9da83cc8131b146152db
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to suspicious PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or perform malicious actions upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://secretlove.ch/ckfinder/userfiles/files/siwowabesifubejarugogok.pdf In PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/xoxabozinanamoropix.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/lenosevomukatuw.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142bf521f313---pinunodimete.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/73957695409.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/xijerifukabuxezonewevaki.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/58768882408.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/41294908812.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/vomegogaduperoromuve.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/taxovidesolaxorojenorif.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/zeneronutikagusabafogis.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/53011288683.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/jiralabegoj.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/85367824831.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141d933e8207---32264169796.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/sawikimevosus.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/91557981415.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/10187601016.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/88431166857.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/sevabizenato.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/tesujukezilud.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/57535887042.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/39846337419.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/dokigafuzutipaluzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=dash+tag+download+play+storePDF 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_off0000cafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFC 16412 bytes
SHA-256: 6ccca7390a973e8cd5ff2ed25f6f982bcffdedc99e230c1f91b6ed168b503736
font_01_sfnt_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 10780 bytes
SHA-256: 5a11a9e5b13861a9b0b68439470606d7c3f208f3b330195e24af072b48ae4de4
font_02_sfnt_off00010db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1