Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f0d63fcc2b8d4d…

MALICIOUS

PDF

74.4 KB Created: 2021-10-24 01:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cf22091daafdf386cca5c7c861a85cfa SHA-1: c75f49754d35550d1f6548f70ced5bed5ba5d2c8 SHA-256: a8f0d63fcc2b8d4d9af81533ae2f633a46066d3b628ec6b07949b03306de1c7a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to external URLs, as suggested by the PDF_URI heuristic and the numerous external links found, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.ruchya.com.tw/upload/files/68893534670.pdf In PDF document text
    • https://colakcivi.com/userfiles/file/51541613908.pdfIn PDF document text
    • https://bdata.vn/upload/files/7520972376.pdfIn PDF document text
    • https://avukatwebsitesi.cicasoft.com/upload/files/29539111378.pdfIn PDF document text
    • http://kes.org/upload/editor/files/pisofidasozoja.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/13622518187.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/nesulolisekije.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/55973485652.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/tozixolidugomixuvi.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/wowavofajes.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/tejujigavivivakaduwurez.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/tafuzupirijax.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/22943331711.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/dumubafiwini.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/21143208559.pdfIn PDF document text
    • http://knauto.com/upload/file///33901031277.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/74085918654.pdfIn PDF document text
    • http://domosplast.hu/files/file/jegavavopexofesan.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/28585857689.pdfIn PDF document text
    • https://actor-conseil.com/files/file/12600510985.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/xagedizusolawobev.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/juwijajizevimi.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/gonatojejusokakifepizo.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/91412903219.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/nazoladezebotibi.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/tgwjJlsMqHc/uplcv?utm_term=blood+clot+while+on+blood+thinnersPDF 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_off0000c4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD9 10584 bytes
SHA-256: 7a4238d4e30f83aad0dfe1270283a66063804f1b94736422a7cceff327cb0d26
font_02_sfnt_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 15268 bytes
SHA-256: 25ea919047518781e977cd6c389e6309f1f6374bd8bd67dde6575322b927b0b9