Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5eb7b624752faa…

MALICIOUS

PDF

71.5 KB Created: 2021-09-16 01:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 11395a9418c1cde1be8f07b8e3aa5419 SHA-1: 7de07f91b9136a69021a945b0f2e1147c4372026 SHA-256: 9b5eb7b624752faa4841c99f30273912208b8b1e5fb6bae30d0e4fe05d7b8d69
174 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link to an algorithmically generated URL, indicating an attempt to download a second-stage payload. The PDF also exhibits characteristics of a link farm on disposable hosting, suggesting a phishing or scamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://touchpanelpro.com/upload/files/95852733133.pdf In PDF document text
    • http://rickgrisolia.com/userfiles/files/91376735846.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/70033382961.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/parudademizagojesovuxoxug.pdfIn PDF document text
    • http://muszempilla.com/files/file/2264745129.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/lufemupoposixad.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d29c7edf2f24ed0d8782578c96c782b6/fofetejebodosereliwerel.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/38578429820.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/75209138112.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/pesujenefuwozutavage.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091314282570554.pdfIn PDF document text
    • http://watch62.ru/files/files/43264406113.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/71279053119.pdfIn PDF document text
    • http://eventechsite.com/files/files/64840719462.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/tidutira.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/mipubomumemusemipivumesez.pdfIn PDF document text
    • http://showpelec.com/data/file/20210909_084851_688.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/wukegeregid.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/piketifuninisifejuxa.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/mewodimudatevufege.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/76455741187.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/bivadon.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/31333267455.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/38716133722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=works+of+william+shakespeare+pdfPDF 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_off0000b6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEC 10732 bytes
SHA-256: 02c01b468aef20112e24187f4afb2bb5b2557a742c777ee5df2fb479e711defa
font_02_sfnt_off0000e798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 15600 bytes
SHA-256: 0ad34ae5d5f68f8310e57e0a9f2b30856f9dbc4eaf04e3fddf608ad9f247f52b