Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f18b01ceb85944f…

MALICIOUS

PDF

71.7 KB Created: 2021-09-24 22:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a3fb5734bc749895b931f2dc4572e09b SHA-1: 8769f382e0e99ba2de0e40a8c0ad625c377f6118 SHA-256: 7f18b01ceb85944f494d98f6b74bff9717d09c97368f26e54565d731e087f4be
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URIs suggest a link farm designed to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=note+9+screen+size+vs+note+20+ultra PDF link annotation
    • http://ux-school.ru/files/files/pugotowo.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/nezifubifabuvozawo.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148256a5da9e---rawexobukatatobedewa.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/37048314489.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/dureja.pdfIn PDF document text
    • https://mcsfood.com/images/file/jiralevaviwupubar.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/womalisefutikupudixonako.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/81143401016.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/87045467221.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/90322571060.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/91731523416.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/93002205525.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/gaxemikajojasiforijibokev.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/nifoxidil.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/fawetuziji.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/45885452207.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/39619796402.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/loreruwa.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/wenef.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/13823816329.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/74935905138.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161340ad01df52---30924105662.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/suwuxizu.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_off0000b053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB053 10836 bytes
SHA-256: 890a6b6cd099552292e5c95fdec92fbb8b92207c92edbf8339f36dc240dff555
font_01_sfnt_off0000c9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B4 18508 bytes
SHA-256: 836f6bbf58d36f04bfacdfd656112a5f2a6d441a7ed3322ae4df272c16a9f0db

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