Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fbaa6b9d1435e2f…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 15:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e9a032b0cf4502dccc4b82e3c3b8e4f3 SHA-1: 1eb5bd14e4b44ad1cbdd3d489b7f743277f27842 SHA-256: 6fbaa6b9d1435e2f3c2eac5e3248dd8cf9223e2f86c11677c3b3a98c17de2957
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier indicated high maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this. No scripts were extracted, but the structure suggests it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/081422007836.pdf In PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/bukenexufodirobaparug.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/xepipajagilusuwu.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613837f7dcc04---49802618852.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/davibakurariligaxi.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/nofemuligimapidororim.pdfIn PDF document text
    • http://lamay.de/userfiles/file/63232273322.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/mobunoxuwi.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/45666219049.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/jevanoxexefewonaximu.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/67269176935.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/rowiwefula.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/90438285686.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/rululafofirivamejuburozaf.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/vajemasazozesemisesowa.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ua1jju9dgg6r3ivp2llrtcd7u4/xotugotoninaz.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/81835232890.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/wujopevogefegonapaseni.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/9759118681.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/85470451562.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/moxikonozejiwobi.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/safelolilolemoribo.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210916021102417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+hide+pictures+on+galleryPDF 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_off0000d04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE865 11084 bytes
SHA-256: 89ad7763f2e5b1de70a60b2f5c71c568da4ebf7b639629aa98dfe89ad36d7188
font_02_sfnt_off000101ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FF 17444 bytes
SHA-256: 8cd63da92e754098263a6f01d533710bf5f44aad2c9d31f0b629cb5016d75d04

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