Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8db3e7a50631f0…

MALICIOUS

PDF

76.9 KB Created: 2021-09-16 09:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bc252f5ec2c80016fdcbb47313c1f546 SHA-1: 15856aedb58cb617795f004677b613fdf17ccbba SHA-256: 1f8db3e7a50631f01a5083637a2d52d59de8c1a5bfea7355e63b592ba5bd3ad7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a collection of links on disposable domains, likely for phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=toca+hair+salon+3+mod+apk PDF link annotation
    • http://wwsm-us.com/files/file/xabujula.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/48769585437.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/12183334046137455f3ee5c.pdfIn PDF document text
    • https://limsurempat.com/contents/files/kufafasuzoratevaguka.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161323d9db0593---72412143119.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/dedebawigav.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091612212373499.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109091653365106.pdfIn PDF document text
    • http://bptramptour.pl/files/file/depegujafezok.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/loxujap.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/23987054184.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/24365684688.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/22812718072.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/pikemiminafadaba.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/88374589075.pdfIn PDF document text
    • https://datenglagi.com/contents/files/83989242209.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/fukumuzum.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/dawuzake.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/sorurekekubakuriwoxe.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614118bbea2c5---bimofenetozug.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/37086594032.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_off0000c9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C6 10776 bytes
SHA-256: 3583b9061df318fe85f6c24d8e4fa6aeb255361b1ceff15e59b4a2eb027d7b2e
font_01_sfnt_off0000e25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 17024 bytes
SHA-256: dceba336ed326fa8fb31727b227b683d7d47cc5a89d0ee2b518f10ba1f87feac

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