Malicious PDF — malware analysis report

Static analysis result for SHA-256 517ab8591eb57946…

MALICIOUS

PDF

70.4 KB Created: 2021-09-16 05:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0899d7ec0b34fcf5aaec863467524873 SHA-1: 40a0d3d2e277b30283ef3789ff7784354e026fb9 SHA-256: 517ab8591eb57946056370d754cad4cc4e350a77985e62cba9b5907279b87f4b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, with a prominent one leading to a domain associated with a fake download lure for 'house flipper'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=house+flipper+download+free+android PDF link annotation
    • http://gewidor-gmbh.de/uploads/files/pipokedomarufupasewusene.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/jasiwa.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/nebijaxinoxeboba.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/debunoximatogebupela.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///xowiluninutixijuf.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/papamip.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/pejugevifiriwubeso.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/wukekemabamolelosujadate.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/wipopabunanoleti.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/1611103661.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/rofagolupunotoja.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/19830084302.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/pojivojazuxanodunogurur.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/12190330107.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/79666719202.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/narozosasunelazejoduxi.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/fukejurijejuxiva.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161422d7666db5---5226125539.pdfIn PDF document text
    • https://sadex.pl/fck/file/86070197510.pdfIn PDF document text
    • http://rayer.cn/d/files/zuwonapevilo.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/15631077833.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/32409828950.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/tovemupozixadifuxuw.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/lapiwef.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/befe032f1bfb3a0f63dc414f438760b8/guvikazavajetemamonatex.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_off0000b450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC62 15640 bytes
SHA-256: 423f0b227e54e7ee61663fa08c9aaea8bec09a49aa35c4a1618bceff9dd960eb
font_02_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 10572 bytes
SHA-256: 9e5beda2de36f76ca88b5c521e8349a1f4664cdf1029c1238e84598a413b28e6