Malicious PDF — malware analysis report

Static analysis result for SHA-256 5120886a195334e9…

MALICIOUS

PDF

73.0 KB Created: 2021-09-10 19:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fed9e1c61c10f0e1b502b8c1b0553b6e SHA-1: 357e65c798472aac4794f2087a81d6315094b643 SHA-256: 5120886a195334e92c99bb49e64339fe1b59f5ab306cbe0879850d6cad7a5a12
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates that the document is part of a link farm, and the ML classifier strongly suggests maliciousness. The embedded JavaScript likely facilitates the redirection to the numerous external PDF URLs found, potentially serving as a lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • 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 http://cungcapbaoduongcuanhatban.com/upload/files/58102560286.pdf In PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/pivibuzerif.pdfIn PDF document text
    • http://edituj.cz/res/file/70617207800.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/86498490474.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/jizidifuxuger.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/75349288491.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/84596820853.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/15356167857.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/bajinajen.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/17464004322.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/wizifok.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ajm3p525q5hd9l9mgb3v3lmcp2/33170309402.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/56085639035.pdfIn PDF document text
    • http://infosierra.es/images/editor/1251884345.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ata4nvk6vd3nol4d5h5uej11d0/kuwuvibawepenodu.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/deserurejobokunababinigo.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/zalisofupokojoso.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/metepuvuguzava.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/gixalogupageruzelefag.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/luxefewe.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/14749677845.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109082205235262.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/94476933982.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/48416476926.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/wadadena.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/romusexifixatogekodewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=widget+ios+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_off0000badf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADF 10368 bytes
SHA-256: 248871277ac65f2ee5d8ffda0922a2bdb88c28c48b95f49c21cea0e550ab6eeb
font_01_sfnt_off0000d23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23A 17340 bytes
SHA-256: fd755ef8ee19c8592d33747a70af509e29903af5bf9739bc1b66a8235961072c
font_02_sfnt_off0000fe5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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