Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb18573c7aa9e17…

MALICIOUS

PDF

75.4 KB Created: 2021-09-12 04:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f8b371189d82f1b9d7734c9ae5d8a574 SHA-1: e676d6f1273317e9714b5de5c1227944684dd87d SHA-256: ceb18573c7aa9e17d36cc5a94e5eafde77da2ae182087428c9cfaa93b6e4cb65
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, suggesting it functions as a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for links. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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.
  • 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://rougezenekar.hu/files/file/20512148520.pdf In PDF document text
    • https://dienlanhhonganh.com/images/pic/file/teraxevokafovebawo.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210910_18ECA54624894E30.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/24014081378.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/voxawukezuzalidoje.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/30736528478.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/xurudifad.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/20409142143.pdfIn PDF document text
    • http://wdnederland.nl/file/12985449195.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/tizisegubobaroxukutuziz.pdfIn PDF document text
    • http://lecostationery.com/files/file/jovusagugibofubebaxeki.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/32354267505.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/doxawasuvepuxaduwuduxoru.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed7eab89f---8311962798.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/64626058138.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/81320759716.pdfIn PDF document text
    • https://shevian.com/images/file/palovemupizol.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/26956835238.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/2929467284.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/mipigugerakotimu.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/29184349438.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/2373384023.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/52468815656.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/jevudogataviwivijofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=shadow+fight+2+unlimited+everything+and+max+level+apkPDF 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_off0000bbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C5 19040 bytes
SHA-256: 90a4342029996d51a1c3a8730c9f0025b4ef1719c28d3f00a2c1f9eabb4417f7
font_02_sfnt_off000104e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E5 11532 bytes
SHA-256: 06d91a37e06cbdb9093541cf336157d0a0071035206c30db99becc62c2a2196c