Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab406decc7ca835…

MALICIOUS

PDF

86.9 KB Created: 2021-09-17 06:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3185898e67b77be6c66176a71d21d1c1 SHA-1: f52305e0e3ffb0b90e57f809d88b5a1dee5e8231 SHA-256: 0ab406decc7ca8356008459689aff93aec695fa467bccee34d922f2e6c76cb83
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses social engineering tactics like 'ClickFix' and 'Clipboard command execution lure', instructing the user to paste commands into a terminal. This strongly suggests the document is designed to trick the user into executing a malicious command, likely to download and run a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://edu-mate.kr/_UploadFile/Images/file/29095252174.pdf In PDF document text
    • http://jnnycc.org/userfiles/file/13158396978.pdfIn PDF document text
    • http://superazs.ru/images/news/file/12453094134.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/rofopudox.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/33374600035.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/85798562522.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/gojevosuletirigelekegur.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/17009577164.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/zodig.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/suxavezus.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/tidodugiruvafedipisenel.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/17138403335.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/78004119036.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/jupag.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/2145171475.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/95534069761.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/53910298479.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/88624942057.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/81541954051.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/2334789307.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143e35f3bf72---25027688585.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/lewoz.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/l9m8c7jp52q7m0i2vgvhphvgrt/93583320351.pdfIn PDF document text
    • https://isleo.com/i_photos/file/vufabasexarelodotide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=terminal+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_off0000eebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 10108 bytes
SHA-256: f4dd8047dd614e7614eae51f1e153057e6e3a9ecfa24fedc3f175165548aa4a1
font_02_sfnt_off00011d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 18572 bytes
SHA-256: 1f10f96962763de960b0d1da777921885b545278b5b05d62bdf724cbbd2ba0cf