Malicious PDF — malware analysis report

Static analysis result for SHA-256 1290d21a768a5232…

MALICIOUS

PDF

70.8 KB Created: 2021-10-02 20:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f4ae8be2ed47a8eecf0fd22ed38eb911 SHA-1: 100b1456edd0817f5528d3c40bf9533f3d150aaf SHA-256: 1290d21a768a523237d4209e5e58b2490e826bc0fbaaf3964dbfab27f69a125d
134 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It includes a heuristic indicating it's a link farm on disposable hosting, pointing to a PDF hosted on 'shethof.ch'. The embedded JavaScript and the nature of the linked PDF suggest an attempt to deliver a malicious payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://shethof.ch/cgi-bin/dynamisch/file/mimerowisorasoziwogegi.pdf In PDF document text
    • https://ibshospitals.com/userfiles/file/kaferakosotubupune.pdfIn PDF document text
    • https://baongochoa.com/upload/file/57820664033.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/bimabigumun.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/vofisuguwaturozunifupawam.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/gisodedavov.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/limopirirosiluxapaweti.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021926746131278.pdfIn PDF document text
    • http://greenegiving.aboutgiving.net/sites/default/files/editor/file/61178949880.pdfIn PDF document text
    • https://premiersuli.hu/files/files/pamux.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202191002804046.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/namivudasalajod.pdfIn PDF document text
    • https://fishboat.hr/files/roxuli.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/fidoganewovizazu.pdfIn PDF document text
    • https://renteci.com/imagens/file/1797697213.pdfIn PDF document text
    • http://hnyinfeng.com/d/files/buralovorepupawojen.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/41nh12di1oe92hioooodav5fqg/39215184788.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/gokulewuromakenu.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/juxosupiwulolazifafuloxu.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/sonidixawegedusufugamedu.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/marovepazivur.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/powaripejozuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pro+swapper+downloadPDF 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_off0000b29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAD 17080 bytes
SHA-256: 97db4c11b530e9928298cc1dd044725942b071fa47dce07bb3f4f51bc415c10f
font_02_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 10280 bytes
SHA-256: 95b819eb396416f8be513708a572b6a892812929b841e84689e66884b600c32a

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