Malicious PDF — malware analysis report

Static analysis result for SHA-256 31226ae90ac44c3a…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 07:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 54af17206f787a785e53d535a5c85c98 SHA-1: 9ac1bb2e6e2c35f90986a5d42e7e2318a4a9c930 SHA-256: 31226ae90ac44c3a367038606ff43689a4dbc4497ca3452f62a91c80ca915230
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs that point to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF's structure is optimized for search engines to host disposable links.

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://laborke.ru/uplcv?utm_term=best+android+keyboard+app+for+tablet PDF link annotation
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/nuribulexegepumoteki.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/41381681438.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/tegavetaboletefa.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/navor.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/41407313117.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/dodazebid.pdfIn PDF document text
    • http://kant21.com/userData/board/file/13736854646.pdfIn PDF document text
    • http://hidropro.hu/upload/subulaxakasagez.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/bipariravalowa.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/kugila.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/kixolo.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/jejowerelenakexamesafero.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/50747033402.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/vadidet.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/vuwiwejuf.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/fuvidisemurob.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/radiporudeloweziweguvuwer.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/53908967795.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/78860060169.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109060211254984.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c7fe565cd7---saxositeluf.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109121855349201.pdfIn PDF document text
    • http://askort.pl/Upload/file/6979934900.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/298157955.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021092012462473499.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_off0000b1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BC 10892 bytes
SHA-256: b62b4ac4dc957d0f396fdd920d2036961bb142921893b322fcc4ae956cff7ac8
font_01_sfnt_off0000cadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADF 16672 bytes
SHA-256: 93bf7c96277860e63b78c204e79e35280104bfc8d6d7f67597cffcb1bd9a89bf
font_02_sfnt_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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