Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5f99b4a0cf4e89…

MALICIOUS

PDF

80.3 KB Created: 2021-09-24 00:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c8ab231da51b3700fe6cd6fae69fcfe1 SHA-1: df884eb39ae38814635d486d7d39a798621726d5 SHA-256: db5f99b4a0cf4e897fe0b6351fc4d04f3e33e8273dc876aa47d93b1b0e70268e
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file suggests it was delivered as an attachment, aligning with T1566.001.

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://allytemp.ru/uplcv?utm_term=spanish+1+final+exam+study+guide+pdf PDF link annotation
    • http://bangladeshceramicsociety.com/uploads/editor/files/zinomi.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/71032560607.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/2082574329614c98e51c731.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/gusebimupafoberuwaxepi.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613105b63dcd1---66181365712.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/27344235279.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/razefavofufilolij.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/xajemapovoxibulatujunatip.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/luwinozekawugijeropepomo.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/82366130129.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/81982721754.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/78206024566.pdfIn PDF document text
    • http://hklh.vip/data/attachment/file/padijemumixejolugumujas.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/57354231860.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/fifideberexujexe.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/nafepovonebavididex.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/tikelig.pdfIn PDF document text
    • http://d-innovation.com/upload/files/burixijixanapaluxetopoduz.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/11871203447.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/67603484586.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/54608159267.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/wumizakipodatijavasorumur.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/99219947541.pdfIn PDF document text
    • http://vollaracis.com/UserFiles/file/giwigarevuve.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/78766868294.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_off0000d640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD640 16912 bytes
SHA-256: 718bda78c3d88f0dd58af90aff3523ade04a9fb1cc0a1ba79886d6049ebde5f8
font_01_sfnt_off00010181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10181 11168 bytes
SHA-256: 01b5c6eace01567c0ec7a6ffea67920484ac4c958c30756192eaec433537050c
font_02_sfnt_off00011b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1