Malicious PDF — malware analysis report

Static analysis result for SHA-256 92daf839725b2565…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 10:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4e24e40e4a5f99b3245a06b4a62e18de SHA-1: e578ea34175511890673544b39c7e965a9e1b773 SHA-256: 92daf839725b25659b830919329cbbe8682aa702e161202f3cd759832e9c106b
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to external PDF files, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the use of disposable hosting for these links, reinforcing the phishing or malware distribution vector.

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 http://akcompany.vn/uploads/userfiles/file/28931476382.pdf In PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210902_02CBC3E14B35BF9B.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/bubezesazunujenejonosix.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/42388188455.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/lajiladamivad.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/9644336792.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/79398541291.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/nijunimamawojow.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/30121750610.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/japaduludoxozapazirumuni.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/86142002354.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/93807875929.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/pojesonat.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/38908275926.pdfIn PDF document text
    • http://tradotel-riviera.com/file/14505701044.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/juvomiwagif.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/121543065526.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091514021473499.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/paseriwokapegar.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/2419523776.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/73698220645.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/24562314767.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1635215d5---wopul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=anime+icon+app+for+androidPDF 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_off0000e5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE14 10452 bytes
SHA-256: a6c1b9fe7675aa62b1e2eceae204b6ac71a987990802942b66cf0bad76c1c947
font_02_sfnt_off000115b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 17696 bytes
SHA-256: 4ec9fe31a8e793f13a27eef9f9a88a653ce32fe49287f851e83af95429eb5fb1

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