Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab93d52d5b79954c…

MALICIOUS

PDF

68.8 KB Created: 2021-09-29 06:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a785bb4c88a0f33424fa0cd31db9968 SHA-1: f0d5f6aa1ab072002be8b0968e57f2c0e107a29e SHA-256: ab93d52d5b79954cb6463b59075a3555e9c618f7b0f001b59b1b32eb91ad2f36
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=applied+sport+management+skills+pdf
    • http://yey.uw52.com/upload/files/fipavaburafifakugir.pdf
    • http://metrocars.london/survey/userfiles/files/25031853113.pdf
    • http://romovi.net/sgi_userfiles/userfiles/files/xekazefafemizubogi.pdf
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/voroxufadomunagado.pdf
    • https://grandhotelushba.com/userfiles/file/53361733808.pdf
    • https://etcbt.com/userfiles/file/kebovixomosebawa.pdf
    • https://heritran.vn/uploads/news_file/kexawixixakewitex.pdf
    • https://dawnraytech.985.tw/data/file/userfiles/files/3261321575.pdf
    • http://irinabailey.com/upload/files/vawonazefokam.pdf
    • https://sambelteri.com/contents/files/gawedafogow.pdf
    • http://alajwakh.com/uploaded_files/userfiles/files/xejez.pdf
    • http://elfuklid.cz/foto/Image/file/nuzikige.pdf
    • https://laatjehuisweerstralen.nl/upload/file/kemurimafaborugidag.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491357014d2---vajonatagusadizanowivokep.pdf
    • http://epmachine.ru/d/files/55358533015.pdf
    • https://chuyennhakienvangvn.net/upload/files/88948629626.pdf
    • http://faradbox.pl/files/file/97387310409.pdf
    • http://naphotelbangkok.com/userfiles/files/ziliriboso.pdf
    • https://royal-art.pl/uploads/userfiles/files/73466097331.pdf
    • http://www.dkmodels.net/ckfinder/userfiles/files/44450333868.pdf
    • https://exlite.it/ckfinder/userfiles/files/82937531546.pdf
    • https://nhabe.com.vn/ckfinder/userfiles/files/godokadofazotapagazi.pdf
    • https://nucamsa.es/userfiles/files/22737306.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16148cdcad0add---relipepasesujurabi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afe9.bin
e1de0ccec4cf183158a686af3212d0c78eec387107c13c1cf291c0198336206b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE9 14604 bytes
font_01_sfnt_off0000d477.bin
1fcc466da7e6305d280602b0d897db0e3f886c246d83523c5a3fd81724fbd2f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD477 10916 bytes
font_02_sfnt_off0000ed89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED89 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.