Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc5c26942214a61…

MALICIOUS

PDF

86.0 KB Created: 2021-09-20 04:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 840ce2df17290e1d5d4b57ba3f61f4a0 SHA-1: bf4ac69374ded6d6f1a7350acc1951728a470e47 SHA-256: ebc5c26942214a61ee6627d4d21855aa6bc54d49b32901d07b78a4732ba45458
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links pointing to various domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/l9mpkqlbb8v8bvbsf869mtrarh/71797720778.pdf In PDF document text
    • http://jgbt.us/pds/userfiles/files/tokegilesiginarimuz.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/visamutoronedefabituxaf.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/wasaxaleli.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/kojunusumitemo.pdfIn PDF document text
    • http://sksound.com/userfiles/file/vapagixidobofuxukesuxa.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/19453995661.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/67141817219.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/43902606901.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/64035879407.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/belem.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/71717045218.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/rokodedi.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa21d27932---felejovizo.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/27259904096.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/79483982445.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/45695087034.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/pitorudovuf.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/mewetef.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/26463478934.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/ribosidopugosobepe.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/54031444124.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/jowisev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=apa+7th+edition+guidelinesPDF 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_off0000e890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 19156 bytes
SHA-256: 0bdd2ac9045e0a0a4ea126489815dc8ad182bc014d659f0fdca33005e9e17d5c
font_02_sfnt_off00013209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13209 10700 bytes
SHA-256: 235557bf66624ba2df33ea8b8453b56446d9acfe4637f4cefab18100ef7ac926