Malicious PDF — malware analysis report

Static analysis result for SHA-256 1870082efbbe8ea3…

MALICIOUS

PDF

83.8 KB Created: 2021-09-11 23:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ad52476412dbb1bf4862196ec803cfb SHA-1: a5ff6a8a21a0f078da723e4fa996bf347e8ed2ac SHA-256: 1870082efbbe8ea36944420c55a748fcc782347a283a2541759e7e7c5aa49a22
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous embedded URLs, many pointing to disposable hosting, and exhibits characteristics of a link farm. Crucially, it includes a 'Clipboard command execution lure' heuristic, indicating it instructs the user to copy and paste content into a shell, likely to execute a malicious payload. The presence of multiple PDF_URI heuristics further supports the malicious intent of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://yves-segers.be/userfiles/files/28559311430.pdf In PDF document text
    • https://mavibusiness.it/file/jedigobabefipo.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16130757f08a76---64515305826.pdfPDF link annotation
    • http://dh-cell.com/ckfinder/userfiles/files/didubutakijifefope.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/58945581514.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/19642869685.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/80320217331.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/21172835473.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210909132745.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/rusojarugejonevivenofub.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/80296131000.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/25239410188.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/xetinetagu.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/salazosodubaxuv.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/23557393789.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/45718462707.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/ronavatum.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/xuwiruwuxebimibelaboje.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/pabigixejevuvavusajatat.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/2639045326.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/lareligazulosukakaraj.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/jidumabifo.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/62005876450.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3ea0e39f96bdc027e3b9ef4a9d402281/zevopem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+change+resolution+in+androidPDF 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_off0000e1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EE 10828 bytes
SHA-256: c47de1f390f37180debfa0a0074d1eb9217792c45a63aa406c6ab9c25063c11b
font_01_sfnt_off0000faa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 17884 bytes
SHA-256: fbf6fcf4c6fcd5d9afc47678bb991a3816cedd25eb1a94c7e7e646a17e0ee17f
font_02_sfnt_off00012933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1