Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7072b9947076570…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 16:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 253b551a8f5b6f2f2eb70b4b7b5d0117 SHA-1: 089fabf98c5a2c89c7129b13f33e57af82181399 SHA-256: d7072b99470765704043421b91ba918cea1d590ed9f6a6321f4b7247040909f7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. The PDF also hosts a large number of external links, many of which are on disposable domains, indicating a phishing or link-farming attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=tekken+tag+zip+file+for+ppsspp PDF link annotation
    • http://goodfortune.hk/UpLoadFile/file///85141080299.pdfIn PDF document text
    • https://majubesar.com/contents/files/novaxunajulidisidibanuso.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/54060980704.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/16761408326.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/peronefibexokilosusura.pdfIn PDF document text
    • http://aquatherm-graz.at/files/98342491470.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/lanofufure.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/80838864960.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/feduximadatudebumutox.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/lewopivipoge.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/jegosotafanisupalevuv.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/97125379336.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/kanuboba.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/28023304891.pdfIn PDF document text
    • http://vucert.vn/uploads/files/fanome.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134a968e32b6---16167192929.pdfIn PDF document text
    • http://mobitransjogja.com/files/23072569756.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/37044746841.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/dozofajusanudofiduju.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/93364777965.pdfIn PDF document text
    • http://yuli-china.ru/d/files/laguduxateraluwexolojaje.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_off0000d0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A7 18136 bytes
SHA-256: 4caf90b73ab3118f362ee322360f10a6780523230716c7ad45b1c1dc4e63223c
font_01_sfnt_off00010047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10047 10648 bytes
SHA-256: 5dc042d3c215479a896aabec1e518e8bb4591c6f81c8c4ccbaa61d782f538203
font_02_sfnt_off000118d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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