Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80c02198e92d025…

MALICIOUS

PDF

69.7 KB Created: 2021-10-01 03:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0b924e56050f0cd6c44c499f11870b0b SHA-1: 2a51375da5aee62e6a92f7413e2c0eda66e24c4b SHA-256: a80c02198e92d025f1d2236183bf62e244977e20b4ae960ef997fe0358897172
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The PDF contains numerous external URIs, many pointing to disposable domains, suggesting a phishing or malware distribution attempt. The embedded JavaScript is likely responsible for executing the malicious payload or redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dailyiat.com/html_upload/file/85201826860.pdf In PDF document text
    • http://cameradungphat.com/uploads/files/vezeretatu.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/89565956996.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/fivumomuzefaximawuruzuned.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161508a7933cbc---fufonuvajefexijenip.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/48891446091.pdfIn PDF document text
    • http://stroi-sistema.ru/img/12767377361.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/57450501917.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/ripomojipatizof.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/tedinowixumun.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/bofiz.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f80b84c1b792622d303db638cdcf10a0/vusekitawovimiwevurezeb.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/20185503374.pdfIn PDF document text
    • https://chilepools.com/contents/files/74853153616.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/73346438789.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/duwerevob.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/24937729622.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/podelovabulotesoxedoduvor.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/98879939582.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/90491349284.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/gukulubupusidet.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/78911953068.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/ronufolivoputit.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/fopabowa.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/beteresezanonemuxaj.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109220159396605.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/99066712172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=reading+comprehension+comparatives+and+superlatives+pdfPDF 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_off0000b2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B5 14396 bytes
SHA-256: 25ca252d69fd912360de43b959223100b04101b63142f41774c3ba595d9df7f7
font_01_sfnt_off0000d6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 11276 bytes
SHA-256: d719a926b11ec9fc51c18e525a7aa44f2eac26e6b13aa2bea66e15b1d0f9d3ca