Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1aebb7e0f6fb382…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 00:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c3090bb8738289666c1d3c73db9c28b SHA-1: 5ab83191ba0a17892bf7749fd62d47b2f45f7fa7 SHA-256: c1aebb7e0f6fb382ab2152732b8f819aabd36e58e83551e7f9f509945ff7f7e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure strongly suggest this document is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://archism.ru/uplcv?utm_term=fundamentals+of+corporate+finance+ross+11th+edition+pdf PDF link annotation
    • http://le-nora.com/userfiles/file/wibinatijejofomulixonuzet.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/jasukuxifodesajidulav.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/7691636876.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/4076811722.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/sutidunikiken.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/2794043817.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/tofivigakerimesepoxonige.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/47780685115.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/253b83cba7f608965916249fc9468c9a/jisewusosati.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/11897254935.pdfIn PDF document text
    • http://limoride.net/gallery/file/wafizivotep.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/rafusaxebelorumugulu.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/wilovitimapunix.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/94194453438.pdfIn PDF document text
    • https://togeltop.com/contents/files/rugosoj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142781aa0761---gesosuzobigajatetev.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109041116052684.pdfIn PDF document text
    • http://sswjeans.com/files/29694272376.pdfIn PDF document text
    • https://chilepools.com/contents/files/putuzigote.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/86474861414.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/18816241347.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/podazowadidotakexum.pdfIn PDF document text
    • http://micro-logic.ro/images/uploaded/file/72676373337.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_off0000b025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83C 11016 bytes
SHA-256: 2db3fb88e092c74ff50292734f61228a8479dadb319b962354277441978be867
font_02_sfnt_off0000e1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 16648 bytes
SHA-256: 4b6403494b73e1934709695d8420c046db6a29ff2e71abe113b2c2440762f37b